Initial import.

1 files changed, 1489 insertions, 0 deletions

diff --git a/chromium/content/child/npapi/webplugin_delegate_impl_win.cc b/chromium/content/child/npapi/webplugin_delegate_impl_win.cc
new file mode 100644
index 00000000000..01f2100417a
--- /dev/null
+++ b/chromium/content/child/npapi/webplugin_delegate_impl_win.cc
@@ -0,0 +1,1489 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/child/npapi/webplugin_delegate_impl.h"
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/metrics/stats_counters.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/synchronization/lock.h"
+#include "base/version.h"
+#include "base/win/iat_patch_function.h"
+#include "base/win/registry.h"
+#include "base/win/windows_version.h"
+#include "content/child/npapi/plugin_instance.h"
+#include "content/child/npapi/plugin_lib.h"
+#include "content/child/npapi/plugin_stream_url.h"
+#include "content/child/npapi/webplugin.h"
+#include "content/child/npapi/webplugin_ime_win.h"
+#include "content/common/plugin_constants_win.h"
+#include "content/public/common/content_constants.h"
+#include "skia/ext/platform_canvas.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "ui/base/win/dpi.h"
+#include "ui/base/win/hwnd_util.h"
+#include "webkit/common/cursors/webcursor.h"
+
+using WebKit::WebKeyboardEvent;
+using WebKit::WebInputEvent;
+using WebKit::WebMouseEvent;
+
+namespace content {
+
+namespace {
+
+const wchar_t kWebPluginDelegateProperty[] = L"WebPluginDelegateProperty";
+const wchar_t kPluginFlashThrottle[] = L"FlashThrottle";
+
+// The fastest we are willing to process WM_USER+1 events for Flash.
+// Flash can easily exceed the limits of our CPU if we don't throttle it.
+// The throttle has been chosen by testing various delays and compromising
+// on acceptable Flash performance and reasonable CPU consumption.
+//
+// I'd like to make the throttle delay variable, based on the amount of
+// time currently required to paint Flash plugins.  There isn't a good
+// way to count the time spent in aggregate plugin painting, however, so
+// this seems to work well enough.
+const int kFlashWMUSERMessageThrottleDelayMs = 5;
+
+// Flash displays popups in response to user clicks by posting a WM_USER
+// message to the plugin window. The handler for this message displays
+// the popup. To ensure that the popups allowed state is sent correctly
+// to the renderer we reset the popups allowed state in a timer.
+const int kWindowedPluginPopupTimerMs = 50;
+
+// The current instance of the plugin which entered the modal loop.
+WebPluginDelegateImpl* g_current_plugin_instance = NULL;
+
+typedef std::deque<MSG> ThrottleQueue;
+base::LazyInstance<ThrottleQueue> g_throttle_queue = LAZY_INSTANCE_INITIALIZER;
+
+base::LazyInstance<std::map<HWND, WNDPROC> > g_window_handle_proc_map =
+    LAZY_INSTANCE_INITIALIZER;
+
+// Helper object for patching the TrackPopupMenu API.
+base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_track_popup_menu =
+    LAZY_INSTANCE_INITIALIZER;
+
+// Helper object for patching the SetCursor API.
+base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_set_cursor =
+    LAZY_INSTANCE_INITIALIZER;
+
+// Helper object for patching the RegEnumKeyExW API.
+base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_reg_enum_key_ex_w =
+    LAZY_INSTANCE_INITIALIZER;
+
+// Helper object for patching the GetProcAddress API.
+base::LazyInstance<base::win::IATPatchFunction> g_iat_patch_get_proc_address =
+    LAZY_INSTANCE_INITIALIZER;
+
+// http://crbug.com/16114
+// Enforces providing a valid device context in NPWindow, so that NPP_SetWindow
+// is never called with NPNWindoTypeDrawable and NPWindow set to NULL.
+// Doing so allows removing NPP_SetWindow call during painting a windowless
+// plugin, which otherwise could trigger layout change while painting by
+// invoking NPN_Evaluate. Which would cause bad, bad crashes. Bad crashes.
+// TODO(dglazkov): If this approach doesn't produce regressions, move class to
+// webplugin_delegate_impl.h and implement for other platforms.
+class DrawableContextEnforcer {
+ public:
+  explicit DrawableContextEnforcer(NPWindow* window)
+      : window_(window),
+        disposable_dc_(window && !window->window) {
+    // If NPWindow is NULL, create a device context with monochrome 1x1 surface
+    // and stuff it to NPWindow.
+    if (disposable_dc_)
+      window_->window = CreateCompatibleDC(NULL);
+  }
+
+  ~DrawableContextEnforcer() {
+    if (!disposable_dc_)
+      return;
+
+    DeleteDC(static_cast<HDC>(window_->window));
+    window_->window = NULL;
+  }
+
+ private:
+  NPWindow* window_;
+  bool disposable_dc_;
+};
+
+// These are from ntddk.h
+typedef LONG NTSTATUS;
+
+#ifndef STATUS_SUCCESS
+#define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
+#endif
+
+#ifndef STATUS_BUFFER_TOO_SMALL
+#define STATUS_BUFFER_TOO_SMALL ((NTSTATUS)0xC0000023L)
+#endif
+
+typedef enum _KEY_INFORMATION_CLASS {
+  KeyBasicInformation,
+  KeyNodeInformation,
+  KeyFullInformation,
+  KeyNameInformation,
+  KeyCachedInformation,
+  KeyVirtualizationInformation
+} KEY_INFORMATION_CLASS;
+
+typedef struct _KEY_NAME_INFORMATION {
+  ULONG NameLength;
+  WCHAR Name[1];
+} KEY_NAME_INFORMATION, *PKEY_NAME_INFORMATION;
+
+typedef DWORD (__stdcall *ZwQueryKeyType)(
+    HANDLE  key_handle,
+    int key_information_class,
+    PVOID  key_information,
+    ULONG  length,
+    PULONG  result_length);
+
+// Returns a key's full path.
+std::wstring GetKeyPath(HKEY key) {
+  if (key == NULL)
+    return L"";
+
+  HMODULE dll = GetModuleHandle(L"ntdll.dll");
+  if (dll == NULL)
+    return L"";
+
+  ZwQueryKeyType func = reinterpret_cast<ZwQueryKeyType>(
+      ::GetProcAddress(dll, "ZwQueryKey"));
+  if (func == NULL)
+    return L"";
+
+  DWORD size = 0;
+  DWORD result = 0;
+  result = func(key, KeyNameInformation, 0, 0, &size);
+  if (result != STATUS_BUFFER_TOO_SMALL)
+    return L"";
+
+  scoped_ptr<char[]> buffer(new char[size]);
+  if (buffer.get() == NULL)
+    return L"";
+
+  result = func(key, KeyNameInformation, buffer.get(), size, &size);
+  if (result != STATUS_SUCCESS)
+    return L"";
+
+  KEY_NAME_INFORMATION* info =
+      reinterpret_cast<KEY_NAME_INFORMATION*>(buffer.get());
+  return std::wstring(info->Name, info->NameLength / sizeof(wchar_t));
+}
+
+int GetPluginMajorVersion(const WebPluginInfo& plugin_info) {
+  Version plugin_version;
+  WebPluginInfo::CreateVersionFromString(plugin_info.version, &plugin_version);
+
+  int major_version = 0;
+  if (plugin_version.IsValid())
+    major_version = plugin_version.components()[0];
+
+  return major_version;
+}
+
+}  // namespace
+
+LRESULT CALLBACK WebPluginDelegateImpl::HandleEventMessageFilterHook(
+    int code, WPARAM wParam, LPARAM lParam) {
+  if (g_current_plugin_instance) {
+    g_current_plugin_instance->OnModalLoopEntered();
+  } else {
+    NOTREACHED();
+  }
+  return CallNextHookEx(NULL, code, wParam, lParam);
+}
+
+LRESULT CALLBACK WebPluginDelegateImpl::MouseHookProc(
+    int code, WPARAM wParam, LPARAM lParam) {
+  if (code == HC_ACTION) {
+    MOUSEHOOKSTRUCT* hook_struct = reinterpret_cast<MOUSEHOOKSTRUCT*>(lParam);
+    if (hook_struct)
+      HandleCaptureForMessage(hook_struct->hwnd, wParam);
+  }
+
+  return CallNextHookEx(NULL, code, wParam, lParam);
+}
+
+WebPluginDelegateImpl::WebPluginDelegateImpl(
+    PluginInstance* instance)
+    : instance_(instance),
+      quirks_(0),
+      plugin_(NULL),
+      windowless_(false),
+      windowed_handle_(NULL),
+      windowed_did_set_window_(false),
+      plugin_wnd_proc_(NULL),
+      last_message_(0),
+      is_calling_wndproc(false),
+      dummy_window_for_activation_(NULL),
+      dummy_window_parent_(NULL),
+      old_dummy_window_proc_(NULL),
+      handle_event_message_filter_hook_(NULL),
+      handle_event_pump_messages_event_(NULL),
+      user_gesture_message_posted_(false),
+      user_gesture_msg_factory_(this),
+      handle_event_depth_(0),
+      mouse_hook_(NULL),
+      first_set_window_call_(true),
+      plugin_has_focus_(false),
+      has_webkit_focus_(false),
+      containing_view_has_focus_(true),
+      creation_succeeded_(false) {
+  memset(&window_, 0, sizeof(window_));
+
+  const WebPluginInfo& plugin_info = instance_->plugin_lib()->plugin_info();
+  std::wstring filename =
+      StringToLowerASCII(plugin_info.path.BaseName().value());
+
+  if (instance_->mime_type() == kFlashPluginSwfMimeType ||
+      filename == kFlashPlugin) {
+    // Flash only requests windowless plugins if we return a Mozilla user
+    // agent.
+    instance_->set_use_mozilla_user_agent();
+    quirks_ |= PLUGIN_QUIRK_THROTTLE_WM_USER_PLUS_ONE;
+    quirks_ |= PLUGIN_QUIRK_PATCH_SETCURSOR;
+    quirks_ |= PLUGIN_QUIRK_ALWAYS_NOTIFY_SUCCESS;
+    quirks_ |= PLUGIN_QUIRK_HANDLE_MOUSE_CAPTURE;
+    quirks_ |= PLUGIN_QUIRK_EMULATE_IME;
+  } else if (filename == kAcrobatReaderPlugin) {
+    // Check for the version number above or equal 9.
+    int major_version = GetPluginMajorVersion(plugin_info);
+    if (major_version >= 9) {
+      quirks_ |= PLUGIN_QUIRK_DIE_AFTER_UNLOAD;
+      // 9.2 needs this.
+      quirks_ |= PLUGIN_QUIRK_SETWINDOW_TWICE;
+    }
+    quirks_ |= PLUGIN_QUIRK_BLOCK_NONSTANDARD_GETURL_REQUESTS;
+  } else if (plugin_info.name.find(L"Windows Media Player") !=
+             std::wstring::npos) {
+    // Windows Media Player needs two NPP_SetWindow calls.
+    quirks_ |= PLUGIN_QUIRK_SETWINDOW_TWICE;
+
+    // Windowless mode doesn't work in the WMP NPAPI plugin.
+    quirks_ |= PLUGIN_QUIRK_NO_WINDOWLESS;
+
+    // The media player plugin sets its size on the first NPP_SetWindow call
+    // and never updates its size. We should call the underlying NPP_SetWindow
+    // only when we have the correct size.
+    quirks_ |= PLUGIN_QUIRK_IGNORE_FIRST_SETWINDOW_CALL;
+
+    if (filename == kOldWMPPlugin) {
+      // Non-admin users on XP couldn't modify the key to force the new UI.
+      quirks_ |= PLUGIN_QUIRK_PATCH_REGENUMKEYEXW;
+    }
+  } else if (instance_->mime_type() == "audio/x-pn-realaudio-plugin" ||
+             filename == kRealPlayerPlugin) {
+    quirks_ |= PLUGIN_QUIRK_DONT_CALL_WND_PROC_RECURSIVELY;
+  } else if (plugin_info.name.find(L"VLC Multimedia Plugin") !=
+             std::wstring::npos ||
+             plugin_info.name.find(L"VLC Multimedia Plug-in") !=
+             std::wstring::npos) {
+    // VLC hangs on NPP_Destroy if we call NPP_SetWindow with a null window
+    // handle
+    quirks_ |= PLUGIN_QUIRK_DONT_SET_NULL_WINDOW_HANDLE_ON_DESTROY;
+    int major_version = GetPluginMajorVersion(plugin_info);
+    if (major_version == 0) {
+      // VLC 0.8.6d and 0.8.6e crash if multiple instances are created.
+      quirks_ |= PLUGIN_QUIRK_DONT_ALLOW_MULTIPLE_INSTANCES;
+    }
+  } else if (filename == kSilverlightPlugin) {
+    // Explanation for this quirk can be found in
+    // WebPluginDelegateImpl::Initialize.
+    quirks_ |= PLUGIN_QUIRK_PATCH_SETCURSOR;
+  } else if (plugin_info.name.find(L"DivX Web Player") !=
+             std::wstring::npos) {
+    // The divx plugin sets its size on the first NPP_SetWindow call and never
+    // updates its size. We should call the underlying NPP_SetWindow only when
+    // we have the correct size.
+    quirks_ |= PLUGIN_QUIRK_IGNORE_FIRST_SETWINDOW_CALL;
+  }
+}
+
+WebPluginDelegateImpl::~WebPluginDelegateImpl() {
+  if (::IsWindow(dummy_window_for_activation_)) {
+    WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
+        GetWindowLongPtr(dummy_window_for_activation_, GWLP_WNDPROC));
+    if (current_wnd_proc == DummyWindowProc) {
+      SetWindowLongPtr(dummy_window_for_activation_,
+                       GWLP_WNDPROC,
+                       reinterpret_cast<LONG>(old_dummy_window_proc_));
+    }
+    ::DestroyWindow(dummy_window_for_activation_);
+  }
+
+  DestroyInstance();
+
+  if (!windowless_)
+    WindowedDestroyWindow();
+
+  if (handle_event_pump_messages_event_) {
+    CloseHandle(handle_event_pump_messages_event_);
+  }
+}
+
+bool WebPluginDelegateImpl::PlatformInitialize() {
+  plugin_->SetWindow(windowed_handle_);
+
+  if (windowless_) {
+    CreateDummyWindowForActivation();
+    handle_event_pump_messages_event_ = CreateEvent(NULL, TRUE, FALSE, NULL);
+    plugin_->SetWindowlessData(
+        handle_event_pump_messages_event_,
+        reinterpret_cast<gfx::NativeViewId>(dummy_window_for_activation_));
+  }
+
+  // Windowless plugins call the WindowFromPoint API and passes the result of
+  // that to the TrackPopupMenu API call as the owner window. This causes the
+  // API to fail as the API expects the window handle to live on the same
+  // thread as the caller. It works in the other browsers as the plugin lives
+  // on the browser thread. Our workaround is to intercept the TrackPopupMenu
+  // API and replace the window handle with the dummy activation window.
+  if (windowless_ && !g_iat_patch_track_popup_menu.Pointer()->is_patched()) {
+    g_iat_patch_track_popup_menu.Pointer()->Patch(
+        GetPluginPath().value().c_str(), "user32.dll", "TrackPopupMenu",
+        WebPluginDelegateImpl::TrackPopupMenuPatch);
+  }
+
+  // Windowless plugins can set cursors by calling the SetCursor API. This
+  // works because the thread inputs of the browser UI thread and the plugin
+  // thread are attached. We intercept the SetCursor API for windowless
+  // plugins and remember the cursor being set. This is shipped over to the
+  // browser in the HandleEvent call, which ensures that the cursor does not
+  // change when a windowless plugin instance changes the cursor
+  // in a background tab.
+  if (windowless_ && !g_iat_patch_set_cursor.Pointer()->is_patched() &&
+      (quirks_ & PLUGIN_QUIRK_PATCH_SETCURSOR)) {
+    g_iat_patch_set_cursor.Pointer()->Patch(
+        GetPluginPath().value().c_str(), "user32.dll", "SetCursor",
+        WebPluginDelegateImpl::SetCursorPatch);
+  }
+
+  // The windowed flash plugin has a bug which occurs when the plugin enters
+  // fullscreen mode. It basically captures the mouse on WM_LBUTTONDOWN and
+  // does not release capture correctly causing it to stop receiving
+  // subsequent mouse events. This problem is also seen in Safari where there
+  // is code to handle this in the wndproc. However the plugin subclasses the
+  // window again in WM_LBUTTONDOWN before entering full screen. As a result
+  // Safari does not receive the WM_LBUTTONUP message. To workaround this
+  // issue we use a per thread mouse hook. This bug does not occur in Firefox
+  // and opera. Firefox has code similar to Safari. It could well be a bug in
+  // the flash plugin, which only occurs in webkit based browsers.
+  if (quirks_ & PLUGIN_QUIRK_HANDLE_MOUSE_CAPTURE) {
+    mouse_hook_ = SetWindowsHookEx(WH_MOUSE, MouseHookProc, NULL,
+                                    GetCurrentThreadId());
+  }
+
+  // On XP, WMP will use its old UI unless a registry key under HKLM has the
+  // name of the current process.  We do it in the installer for admin users,
+  // for the rest patch this function.
+  if ((quirks_ & PLUGIN_QUIRK_PATCH_REGENUMKEYEXW) &&
+      base::win::GetVersion() == base::win::VERSION_XP &&
+      (base::win::RegKey().Open(HKEY_LOCAL_MACHINE,
+          L"SOFTWARE\\Microsoft\\MediaPlayer\\ShimInclusionList\\chrome.exe",
+          KEY_READ) != ERROR_SUCCESS) &&
+      !g_iat_patch_reg_enum_key_ex_w.Pointer()->is_patched()) {
+    g_iat_patch_reg_enum_key_ex_w.Pointer()->Patch(
+        L"wmpdxm.dll", "advapi32.dll", "RegEnumKeyExW",
+        WebPluginDelegateImpl::RegEnumKeyExWPatch);
+  }
+
+  // Flash retrieves the pointers to IMM32 functions with GetProcAddress() calls
+  // and use them to retrieve IME data. We add a patch to this function so we
+  // can dispatch these IMM32 calls to the WebPluginIMEWin class, which emulates
+  // IMM32 functions for Flash.
+  if (!g_iat_patch_get_proc_address.Pointer()->is_patched() &&
+      (quirks_ & PLUGIN_QUIRK_EMULATE_IME)) {
+    g_iat_patch_get_proc_address.Pointer()->Patch(
+        GetPluginPath().value().c_str(), "kernel32.dll", "GetProcAddress",
+        GetProcAddressPatch);
+  }
+
+  return true;
+}
+
+void WebPluginDelegateImpl::PlatformDestroyInstance() {
+  if (!instance_->plugin_lib())
+    return;
+
+  // Unpatch if this is the last plugin instance.
+  if (instance_->plugin_lib()->instance_count() != 1)
+    return;
+
+  if (g_iat_patch_set_cursor.Pointer()->is_patched())
+    g_iat_patch_set_cursor.Pointer()->Unpatch();
+
+  if (g_iat_patch_track_popup_menu.Pointer()->is_patched())
+    g_iat_patch_track_popup_menu.Pointer()->Unpatch();
+
+  if (g_iat_patch_reg_enum_key_ex_w.Pointer()->is_patched())
+    g_iat_patch_reg_enum_key_ex_w.Pointer()->Unpatch();
+
+  if (mouse_hook_) {
+    UnhookWindowsHookEx(mouse_hook_);
+    mouse_hook_ = NULL;
+  }
+}
+
+void WebPluginDelegateImpl::Paint(WebKit::WebCanvas* canvas,
+                                  const gfx::Rect& rect) {
+  if (windowless_ && skia::SupportsPlatformPaint(canvas)) {
+    skia::ScopedPlatformPaint scoped_platform_paint(canvas);
+    HDC hdc = scoped_platform_paint.GetPlatformSurface();
+    WindowlessPaint(hdc, rect);
+  }
+}
+
+bool WebPluginDelegateImpl::WindowedCreatePlugin() {
+  DCHECK(!windowed_handle_);
+
+  RegisterNativeWindowClass();
+
+  // The window will be sized and shown later.
+  windowed_handle_ = CreateWindowEx(
+      WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
+      kNativeWindowClassName,
+      0,
+      WS_POPUP | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
+      0,
+      0,
+      0,
+      0,
+      GetDesktopWindow(),
+      0,
+      GetModuleHandle(NULL),
+      0);
+  if (windowed_handle_ == 0)
+    return false;
+
+    // This is a tricky workaround for Issue 2673 in chromium "Flash: IME not
+    // available". To use IMEs in this window, we have to make Windows attach
+  // IMEs to this window (i.e. load IME DLLs, attach them to this process, and
+  // add their message hooks to this window). Windows attaches IMEs while this
+  // process creates a top-level window. On the other hand, to layout this
+  // window correctly in the given parent window (RenderWidgetHostViewWin or
+  // RenderWidgetHostViewAura), this window should be a child window of the
+  // parent window. To satisfy both of the above conditions, this code once
+  // creates a top-level window and change it to a child window of the parent
+  // window (in the browser process).
+    SetWindowLongPtr(windowed_handle_, GWL_STYLE,
+                     WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);
+
+  BOOL result = SetProp(windowed_handle_, kWebPluginDelegateProperty, this);
+  DCHECK(result == TRUE) << "SetProp failed, last error = " << GetLastError();
+  // Get the name and version of the plugin, create atoms and set them in a
+  // window property. Use atoms so that other processes can access the name and
+  // version of the plugin that this window is hosting.
+  if (instance_ != NULL) {
+    PluginLib* plugin_lib = instance()->plugin_lib();
+    if (plugin_lib != NULL) {
+      std::wstring plugin_name = plugin_lib->plugin_info().name;
+      if (!plugin_name.empty()) {
+        ATOM plugin_name_atom = GlobalAddAtomW(plugin_name.c_str());
+        DCHECK_NE(0, plugin_name_atom);
+        result = SetProp(windowed_handle_,
+            kPluginNameAtomProperty,
+            reinterpret_cast<HANDLE>(plugin_name_atom));
+        DCHECK(result == TRUE) << "SetProp failed, last error = " <<
+            GetLastError();
+      }
+      base::string16 plugin_version = plugin_lib->plugin_info().version;
+      if (!plugin_version.empty()) {
+        ATOM plugin_version_atom = GlobalAddAtomW(plugin_version.c_str());
+        DCHECK_NE(0, plugin_version_atom);
+        result = SetProp(windowed_handle_,
+            kPluginVersionAtomProperty,
+            reinterpret_cast<HANDLE>(plugin_version_atom));
+        DCHECK(result == TRUE) << "SetProp failed, last error = " <<
+            GetLastError();
+      }
+    }
+  }
+
+  // Calling SetWindowLongPtrA here makes the window proc ASCII, which is
+  // required by at least the Shockwave Director plug-in.
+  SetWindowLongPtrA(
+      windowed_handle_, GWLP_WNDPROC, reinterpret_cast<LONG>(DefWindowProcA));
+
+  return true;
+}
+
+void WebPluginDelegateImpl::WindowedDestroyWindow() {
+  if (windowed_handle_ != NULL) {
+    // Unsubclass the window.
+    WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
+        GetWindowLongPtr(windowed_handle_, GWLP_WNDPROC));
+    if (current_wnd_proc == NativeWndProc) {
+      SetWindowLongPtr(windowed_handle_,
+                       GWLP_WNDPROC,
+                       reinterpret_cast<LONG>(plugin_wnd_proc_));
+    }
+
+    plugin_->WillDestroyWindow(windowed_handle_);
+
+    DestroyWindow(windowed_handle_);
+    windowed_handle_ = 0;
+  }
+}
+
+// Erase all messages in the queue destined for a particular window.
+// When windows are closing, callers should use this function to clear
+// the queue.
+// static
+void WebPluginDelegateImpl::ClearThrottleQueueForWindow(HWND window) {
+  ThrottleQueue* throttle_queue = g_throttle_queue.Pointer();
+
+  ThrottleQueue::iterator it;
+  for (it = throttle_queue->begin(); it != throttle_queue->end(); ) {
+    if (it->hwnd == window) {
+      it = throttle_queue->erase(it);
+    } else {
+      it++;
+    }
+  }
+}
+
+// Delayed callback for processing throttled messages.
+// Throttled messages are aggregated globally across all plugins.
+// static
+void WebPluginDelegateImpl::OnThrottleMessage() {
+  // The current algorithm walks the list and processes the first
+  // message it finds for each plugin.  It is important to service
+  // all active plugins with each pass through the throttle, otherwise
+  // we see video jankiness.  Copy the set to notify before notifying
+  // since we may re-enter OnThrottleMessage from CallWindowProc!
+  ThrottleQueue* throttle_queue = g_throttle_queue.Pointer();
+  ThrottleQueue notify_queue;
+  std::set<HWND> processed;
+
+  ThrottleQueue::iterator it = throttle_queue->begin();
+  while (it != throttle_queue->end()) {
+    const MSG& msg = *it;
+    if (processed.find(msg.hwnd) == processed.end()) {
+      processed.insert(msg.hwnd);
+      notify_queue.push_back(msg);
+      it = throttle_queue->erase(it);
+    } else {
+      it++;
+    }
+  }
+
+  // Due to re-entrancy, we must save our queue state now.  Otherwise, we may
+  // self-post below, and *also* start up another delayed task when the first
+  // entry is pushed onto the queue in ThrottleMessage().
+  bool throttle_queue_was_empty = throttle_queue->empty();
+
+  for (it = notify_queue.begin(); it != notify_queue.end(); ++it) {
+    const MSG& msg = *it;
+    WNDPROC proc = reinterpret_cast<WNDPROC>(msg.time);
+    // It is possible that the window was closed after we queued
+    // this message.  This is a rare event; just verify the window
+    // is alive.  (see also bug 1259488)
+    if (IsWindow(msg.hwnd))
+      CallWindowProc(proc, msg.hwnd, msg.message, msg.wParam, msg.lParam);
+  }
+
+  if (!throttle_queue_was_empty) {
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&WebPluginDelegateImpl::OnThrottleMessage),
+        base::TimeDelta::FromMilliseconds(kFlashWMUSERMessageThrottleDelayMs));
+  }
+}
+
+// Schedule a windows message for delivery later.
+// static
+void WebPluginDelegateImpl::ThrottleMessage(WNDPROC proc, HWND hwnd,
+                                            UINT message, WPARAM wParam,
+                                            LPARAM lParam) {
+  MSG msg;
+  msg.time = reinterpret_cast<DWORD>(proc);
+  msg.hwnd = hwnd;
+  msg.message = message;
+  msg.wParam = wParam;
+  msg.lParam = lParam;
+
+  ThrottleQueue* throttle_queue = g_throttle_queue.Pointer();
+
+  throttle_queue->push_back(msg);
+
+  if (throttle_queue->size() == 1) {
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&WebPluginDelegateImpl::OnThrottleMessage),
+        base::TimeDelta::FromMilliseconds(kFlashWMUSERMessageThrottleDelayMs));
+  }
+}
+
+// We go out of our way to find the hidden windows created by Flash for
+// windowless plugins.  We throttle the rate at which they deliver messages
+// so that they will not consume outrageous amounts of CPU.
+// static
+LRESULT CALLBACK WebPluginDelegateImpl::FlashWindowlessWndProc(
+    HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
+  std::map<HWND, WNDPROC>::iterator index =
+      g_window_handle_proc_map.Get().find(hwnd);
+
+  WNDPROC old_proc = (*index).second;
+  DCHECK(old_proc);
+
+  switch (message) {
+    case WM_NCDESTROY: {
+      WebPluginDelegateImpl::ClearThrottleQueueForWindow(hwnd);
+      g_window_handle_proc_map.Get().erase(index);
+      break;
+    }
+    // Flash may flood the message queue with WM_USER+1 message causing 100% CPU
+    // usage.  See https://bugzilla.mozilla.org/show_bug.cgi?id=132759.  We
+    // prevent this by throttling the messages.
+    case WM_USER + 1: {
+      WebPluginDelegateImpl::ThrottleMessage(old_proc, hwnd, message, wparam,
+                                             lparam);
+      return TRUE;
+    }
+
+    default: {
+      break;
+    }
+  }
+  return CallWindowProc(old_proc, hwnd, message, wparam, lparam);
+}
+
+LRESULT CALLBACK WebPluginDelegateImpl::DummyWindowProc(
+    HWND hwnd, UINT message, WPARAM w_param, LPARAM l_param) {
+  WebPluginDelegateImpl* delegate = reinterpret_cast<WebPluginDelegateImpl*>(
+      GetProp(hwnd, kWebPluginDelegateProperty));
+  CHECK(delegate);
+  if (message == WM_WINDOWPOSCHANGING) {
+    // We need to know when the dummy window is parented because windowless
+    // plugins need the parent window for things like menus. There's no message
+    // for a parent being changed, but a WM_WINDOWPOSCHANGING is sent so we
+    // check every time we get it.
+    // For non-aura builds, this never changes since RenderWidgetHostViewWin's
+    // window is constant. For aura builds, this changes every time the tab gets
+    // dragged to a new window.
+    HWND parent = GetParent(hwnd);
+    if (parent != delegate->dummy_window_parent_) {
+      delegate->dummy_window_parent_ = parent;
+
+      // Set the containing window handle as the instance window handle. This is
+      // what Safari does. Not having a valid window handle causes subtle bugs
+      // with plugins which retrieve the window handle and use it for things
+      // like context menus. The window handle can be retrieved via
+      // NPN_GetValue of NPNVnetscapeWindow.
+      delegate->instance_->set_window_handle(parent);
+
+      // The plugin caches the result of NPNVnetscapeWindow when we originally
+      // called NPP_SetWindow, so force it to get the new value.
+      delegate->WindowlessSetWindow();
+    }
+  } else if (message == WM_NCDESTROY) {
+    RemoveProp(hwnd, kWebPluginDelegateProperty);
+  }
+  return CallWindowProc(
+      delegate->old_dummy_window_proc_, hwnd, message, w_param, l_param);
+}
+
+// Callback for enumerating the Flash windows.
+BOOL CALLBACK EnumFlashWindows(HWND window, LPARAM arg) {
+  WNDPROC wnd_proc = reinterpret_cast<WNDPROC>(arg);
+  TCHAR class_name[1024];
+  if (!RealGetWindowClass(window, class_name,
+                          sizeof(class_name)/sizeof(TCHAR))) {
+    LOG(ERROR) << "RealGetWindowClass failure: " << GetLastError();
+    return FALSE;
+  }
+
+  if (wcscmp(class_name, L"SWFlash_PlaceholderX"))
+    return TRUE;
+
+  WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
+        GetWindowLongPtr(window, GWLP_WNDPROC));
+  if (current_wnd_proc != wnd_proc) {
+    WNDPROC old_flash_proc = reinterpret_cast<WNDPROC>(SetWindowLongPtr(
+        window, GWLP_WNDPROC,
+        reinterpret_cast<LONG>(wnd_proc)));
+    DCHECK(old_flash_proc);
+    g_window_handle_proc_map.Get()[window] = old_flash_proc;
+  }
+
+  return TRUE;
+}
+
+bool WebPluginDelegateImpl::CreateDummyWindowForActivation() {
+  DCHECK(!dummy_window_for_activation_);
+
+  dummy_window_for_activation_ = CreateWindowEx(
+    0,
+    L"Static",
+    kDummyActivationWindowName,
+    WS_CHILD,
+    0,
+    0,
+    0,
+    0,
+    // We don't know the parent of the dummy window yet, so just set it to the
+    // desktop and it'll get parented by the browser.
+    GetDesktopWindow(),
+    0,
+    GetModuleHandle(NULL),
+    0);
+
+  if (dummy_window_for_activation_ == 0)
+    return false;
+
+  BOOL result = SetProp(dummy_window_for_activation_,
+                        kWebPluginDelegateProperty, this);
+  DCHECK(result == TRUE) << "SetProp failed, last error = " << GetLastError();
+  old_dummy_window_proc_ = reinterpret_cast<WNDPROC>(SetWindowLongPtr(
+      dummy_window_for_activation_, GWLP_WNDPROC,
+      reinterpret_cast<LONG>(DummyWindowProc)));
+
+  // Flash creates background windows which use excessive CPU in our
+  // environment; we wrap these windows and throttle them so that they don't
+  // get out of hand.
+  if (!EnumThreadWindows(::GetCurrentThreadId(), EnumFlashWindows,
+      reinterpret_cast<LPARAM>(
+      &WebPluginDelegateImpl::FlashWindowlessWndProc))) {
+    // Log that this happened.  Flash will still work; it just means the
+    // throttle isn't installed (and Flash will use more CPU).
+    NOTREACHED();
+    LOG(ERROR) << "Failed to wrap all windowless Flash windows";
+  }
+  return true;
+}
+
+bool WebPluginDelegateImpl::WindowedReposition(
+    const gfx::Rect& window_rect_in_dip,
+    const gfx::Rect& clip_rect_in_dip) {
+  if (!windowed_handle_) {
+    NOTREACHED();
+    return false;
+  }
+
+  gfx::Rect window_rect = ui::win::DIPToScreenRect(window_rect_in_dip);
+  gfx::Rect clip_rect = ui::win::DIPToScreenRect(clip_rect_in_dip);
+  if (window_rect_ == window_rect && clip_rect_ == clip_rect)
+    return false;
+
+  // We only set the plugin's size here.  Its position is moved elsewhere, which
+  // allows the window moves/scrolling/clipping to be synchronized with the page
+  // and other windows.
+  // If the plugin window has no parent, then don't focus it because it isn't
+  // being displayed anywhere. See:
+  // http://code.google.com/p/chromium/issues/detail?id=32658
+  if (window_rect.size() != window_rect_.size()) {
+    UINT flags = SWP_NOMOVE | SWP_NOZORDER;
+    if (!GetParent(windowed_handle_))
+      flags |= SWP_NOACTIVATE;
+    ::SetWindowPos(windowed_handle_,
+                   NULL,
+                   0,
+                   0,
+                   window_rect.width(),
+                   window_rect.height(),
+                   flags);
+  }
+
+  window_rect_ = window_rect;
+  clip_rect_ = clip_rect;
+
+  // Ensure that the entire window gets repainted.
+  ::InvalidateRect(windowed_handle_, NULL, FALSE);
+
+  return true;
+}
+
+void WebPluginDelegateImpl::WindowedSetWindow() {
+  if (!instance_)
+    return;
+
+  if (!windowed_handle_) {
+    NOTREACHED();
+    return;
+  }
+
+  instance()->set_window_handle(windowed_handle_);
+
+  DCHECK(!instance()->windowless());
+
+  window_.clipRect.top = std::max(0, clip_rect_.y());
+  window_.clipRect.left = std::max(0, clip_rect_.x());
+  window_.clipRect.bottom = std::max(0, clip_rect_.y() + clip_rect_.height());
+  window_.clipRect.right = std::max(0, clip_rect_.x() + clip_rect_.width());
+  window_.height = window_rect_.height();
+  window_.width = window_rect_.width();
+  window_.x = 0;
+  window_.y = 0;
+
+  window_.window = windowed_handle_;
+  window_.type = NPWindowTypeWindow;
+
+  // Reset this flag before entering the instance in case of side-effects.
+  windowed_did_set_window_ = true;
+
+  NPError err = instance()->NPP_SetWindow(&window_);
+  if (quirks_ & PLUGIN_QUIRK_SETWINDOW_TWICE)
+    instance()->NPP_SetWindow(&window_);
+
+  WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
+        GetWindowLongPtr(windowed_handle_, GWLP_WNDPROC));
+  if (current_wnd_proc != NativeWndProc) {
+    plugin_wnd_proc_ = reinterpret_cast<WNDPROC>(SetWindowLongPtr(
+        windowed_handle_, GWLP_WNDPROC, reinterpret_cast<LONG>(NativeWndProc)));
+  }
+}
+
+ATOM WebPluginDelegateImpl::RegisterNativeWindowClass() {
+  static bool have_registered_window_class = false;
+  if (have_registered_window_class == true)
+    return true;
+
+  have_registered_window_class = true;
+
+  WNDCLASSEX wcex;
+  wcex.cbSize         = sizeof(WNDCLASSEX);
+  wcex.style          = CS_DBLCLKS;
+  wcex.lpfnWndProc    = WrapperWindowProc;
+  wcex.cbClsExtra     = 0;
+  wcex.cbWndExtra     = 0;
+  wcex.hInstance      = GetModuleHandle(NULL);
+  wcex.hIcon          = 0;
+  wcex.hCursor        = 0;
+  // Some plugins like windows media player 11 create child windows parented
+  // by our plugin window, where the media content is rendered. These plugins
+  // dont implement WM_ERASEBKGND, which causes painting issues, when the
+  // window where the media is rendered is moved around. DefWindowProc does
+  // implement WM_ERASEBKGND correctly if we have a valid background brush.
+  wcex.hbrBackground  = reinterpret_cast<HBRUSH>(COLOR_WINDOW+1);
+  wcex.lpszMenuName   = 0;
+  wcex.lpszClassName  = kNativeWindowClassName;
+  wcex.hIconSm        = 0;
+
+  return RegisterClassEx(&wcex);
+}
+
+LRESULT CALLBACK WebPluginDelegateImpl::WrapperWindowProc(
+    HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
+  // This is another workaround for Issue 2673 in chromium "Flash: IME not
+  // available". Somehow, the CallWindowProc() function does not dispatch
+  // window messages when its first parameter is a handle representing the
+  // DefWindowProc() function. To avoid this problem, this code creates a
+  // wrapper function which just encapsulates the DefWindowProc() function
+  // and set it as the window procedure of a windowed plug-in.
+  return DefWindowProc(hWnd, message, wParam, lParam);
+}
+
+// Returns true if the message passed in corresponds to a user gesture.
+static bool IsUserGestureMessage(unsigned int message) {
+  switch (message) {
+    case WM_LBUTTONDOWN:
+    case WM_LBUTTONUP:
+    case WM_RBUTTONDOWN:
+    case WM_RBUTTONUP:
+    case WM_MBUTTONDOWN:
+    case WM_MBUTTONUP:
+    case WM_KEYDOWN:
+    case WM_KEYUP:
+      return true;
+
+    default:
+      break;
+  }
+
+  return false;
+}
+
+LRESULT CALLBACK WebPluginDelegateImpl::NativeWndProc(
+    HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
+  WebPluginDelegateImpl* delegate = reinterpret_cast<WebPluginDelegateImpl*>(
+      GetProp(hwnd, kWebPluginDelegateProperty));
+  if (!delegate) {
+    NOTREACHED();
+    return 0;
+  }
+
+  if (message == delegate->last_message_ &&
+      delegate->GetQuirks() & PLUGIN_QUIRK_DONT_CALL_WND_PROC_RECURSIVELY &&
+      delegate->is_calling_wndproc) {
+    // Real may go into a state where it recursively dispatches the same event
+    // when subclassed.  See https://bugzilla.mozilla.org/show_bug.cgi?id=192914
+    // We only do the recursive check for Real because it's possible and valid
+    // for a plugin to synchronously dispatch a message to itself such that it
+    // looks like it's in recursion.
+    return TRUE;
+  }
+
+  // Flash may flood the message queue with WM_USER+1 message causing 100% CPU
+  // usage.  See https://bugzilla.mozilla.org/show_bug.cgi?id=132759.  We
+  // prevent this by throttling the messages.
+  if (message == WM_USER + 1 &&
+      delegate->GetQuirks() & PLUGIN_QUIRK_THROTTLE_WM_USER_PLUS_ONE) {
+    WebPluginDelegateImpl::ThrottleMessage(delegate->plugin_wnd_proc_, hwnd,
+                                           message, wparam, lparam);
+    return FALSE;
+  }
+
+  LRESULT result;
+  uint32 old_message = delegate->last_message_;
+  delegate->last_message_ = message;
+
+  static UINT custom_msg = RegisterWindowMessage(kPaintMessageName);
+  if (message == custom_msg) {
+    // Get the invalid rect which is in screen coordinates and convert to
+    // window coordinates.
+    gfx::Rect invalid_rect;
+    invalid_rect.set_x(static_cast<short>(LOWORD(wparam)));
+    invalid_rect.set_y(static_cast<short>(HIWORD(wparam)));
+    invalid_rect.set_width(static_cast<short>(LOWORD(lparam)));
+    invalid_rect.set_height(static_cast<short>(HIWORD(lparam)));
+
+    RECT window_rect;
+    GetWindowRect(hwnd, &window_rect);
+    invalid_rect.Offset(-window_rect.left, -window_rect.top);
+
+    // The plugin window might have non-client area.   If we don't pass in
+    // RDW_FRAME then the children don't receive WM_NCPAINT messages while
+    // scrolling, which causes painting problems (http://b/issue?id=923945).
+    uint32 flags = RDW_INVALIDATE | RDW_ALLCHILDREN | RDW_FRAME;
+
+    // If a plugin (like Google Earth or Java) has child windows that are hosted
+    // in a different process, then RedrawWindow with UPDATENOW will
+    // synchronously wait for this call to complete.  Some messages are pumped
+    // but not others, which could lead to a deadlock.  So avoid reentrancy by
+    // only synchronously calling RedrawWindow once at a time.
+    if (old_message != custom_msg)
+      flags |= RDW_UPDATENOW;
+    RECT rect = invalid_rect.ToRECT();
+    RedrawWindow(hwnd, &rect, NULL, flags);
+    result = FALSE;
+  } else {
+    delegate->is_calling_wndproc = true;
+
+    if (!delegate->user_gesture_message_posted_ &&
+        IsUserGestureMessage(message)) {
+      delegate->user_gesture_message_posted_ = true;
+
+      delegate->instance()->PushPopupsEnabledState(true);
+
+      base::MessageLoop::current()->PostDelayedTask(
+          FROM_HERE,
+          base::Bind(&WebPluginDelegateImpl::OnUserGestureEnd,
+                     delegate->user_gesture_msg_factory_.GetWeakPtr()),
+          base::TimeDelta::FromMilliseconds(kWindowedPluginPopupTimerMs));
+    }
+
+    HandleCaptureForMessage(hwnd, message);
+
+    // Maintain a local/global stack for the g_current_plugin_instance variable
+    // as this may be a nested invocation.
+    WebPluginDelegateImpl* last_plugin_instance = g_current_plugin_instance;
+
+    g_current_plugin_instance = delegate;
+
+    result = CallWindowProc(
+        delegate->plugin_wnd_proc_, hwnd, message, wparam, lparam);
+
+    delegate->is_calling_wndproc = false;
+    g_current_plugin_instance = last_plugin_instance;
+
+    if (message == WM_NCDESTROY) {
+      RemoveProp(hwnd, kWebPluginDelegateProperty);
+      ATOM plugin_name_atom = reinterpret_cast<ATOM>(
+          RemoveProp(hwnd, kPluginNameAtomProperty));
+      if (plugin_name_atom != 0)
+        GlobalDeleteAtom(plugin_name_atom);
+      ATOM plugin_version_atom = reinterpret_cast<ATOM>(
+          RemoveProp(hwnd, kPluginVersionAtomProperty));
+      if (plugin_version_atom != 0)
+        GlobalDeleteAtom(plugin_version_atom);
+      ClearThrottleQueueForWindow(hwnd);
+    }
+  }
+  delegate->last_message_ = old_message;
+  return result;
+}
+
+void WebPluginDelegateImpl::WindowlessUpdateGeometry(
+    const gfx::Rect& window_rect,
+    const gfx::Rect& clip_rect) {
+  bool window_rect_changed = (window_rect_ != window_rect);
+  // Only resend to the instance if the geometry has changed.
+  if (!window_rect_changed && clip_rect == clip_rect_)
+    return;
+
+  clip_rect_ = clip_rect;
+  window_rect_ = window_rect;
+
+  WindowlessSetWindow();
+
+  if (window_rect_changed) {
+    WINDOWPOS win_pos = {0};
+    win_pos.x = window_rect_.x();
+    win_pos.y = window_rect_.y();
+    win_pos.cx = window_rect_.width();
+    win_pos.cy = window_rect_.height();
+
+    NPEvent pos_changed_event;
+    pos_changed_event.event = WM_WINDOWPOSCHANGED;
+    pos_changed_event.wParam = 0;
+    pos_changed_event.lParam = PtrToUlong(&win_pos);
+
+    instance()->NPP_HandleEvent(&pos_changed_event);
+  }
+}
+
+void WebPluginDelegateImpl::WindowlessPaint(HDC hdc,
+                                            const gfx::Rect& damage_rect) {
+  DCHECK(hdc);
+
+  RECT damage_rect_win;
+  damage_rect_win.left   = damage_rect.x();  // + window_rect_.x();
+  damage_rect_win.top    = damage_rect.y();  // + window_rect_.y();
+  damage_rect_win.right  = damage_rect_win.left + damage_rect.width();
+  damage_rect_win.bottom = damage_rect_win.top + damage_rect.height();
+
+  // Save away the old HDC as this could be a nested invocation.
+  void* old_dc = window_.window;
+  window_.window = hdc;
+
+  NPEvent paint_event;
+  paint_event.event = WM_PAINT;
+  // NOTE: NPAPI is not 64bit safe.  It puts pointers into 32bit values.
+  paint_event.wParam = PtrToUlong(hdc);
+  paint_event.lParam = PtrToUlong(&damage_rect_win);
+  base::StatsRate plugin_paint("Plugin.Paint");
+  base::StatsScope<base::StatsRate> scope(plugin_paint);
+  instance()->NPP_HandleEvent(&paint_event);
+  window_.window = old_dc;
+}
+
+void WebPluginDelegateImpl::WindowlessSetWindow() {
+  if (!instance())
+    return;
+
+  if (window_rect_.IsEmpty())  // wait for geometry to be set.
+    return;
+
+  DCHECK(instance()->windowless());
+
+  window_.clipRect.top = clip_rect_.y();
+  window_.clipRect.left = clip_rect_.x();
+  window_.clipRect.bottom = clip_rect_.y() + clip_rect_.height();
+  window_.clipRect.right = clip_rect_.x() + clip_rect_.width();
+  window_.height = window_rect_.height();
+  window_.width = window_rect_.width();
+  window_.x = window_rect_.x();
+  window_.y = window_rect_.y();
+  window_.type = NPWindowTypeDrawable;
+  DrawableContextEnforcer enforcer(&window_);
+
+  NPError err = instance()->NPP_SetWindow(&window_);
+  DCHECK(err == NPERR_NO_ERROR);
+}
+
+bool WebPluginDelegateImpl::PlatformSetPluginHasFocus(bool focused) {
+  DCHECK(instance()->windowless());
+
+  NPEvent focus_event;
+  focus_event.event = focused ? WM_SETFOCUS : WM_KILLFOCUS;
+  focus_event.wParam = 0;
+  focus_event.lParam = 0;
+
+  instance()->NPP_HandleEvent(&focus_event);
+  return true;
+}
+
+static bool NPEventFromWebMouseEvent(const WebMouseEvent& event,
+                                     NPEvent* np_event) {
+  np_event->lParam = static_cast<uint32>(MAKELPARAM(event.windowX,
+                                                   event.windowY));
+  np_event->wParam = 0;
+
+  if (event.modifiers & WebInputEvent::ControlKey)
+    np_event->wParam |= MK_CONTROL;
+  if (event.modifiers & WebInputEvent::ShiftKey)
+    np_event->wParam |= MK_SHIFT;
+  if (event.modifiers & WebInputEvent::LeftButtonDown)
+    np_event->wParam |= MK_LBUTTON;
+  if (event.modifiers & WebInputEvent::MiddleButtonDown)
+    np_event->wParam |= MK_MBUTTON;
+  if (event.modifiers & WebInputEvent::RightButtonDown)
+    np_event->wParam |= MK_RBUTTON;
+
+  switch (event.type) {
+    case WebInputEvent::MouseMove:
+    case WebInputEvent::MouseLeave:
+    case WebInputEvent::MouseEnter:
+      np_event->event = WM_MOUSEMOVE;
+      return true;
+    case WebInputEvent::MouseDown:
+      switch (event.button) {
+        case WebMouseEvent::ButtonLeft:
+          np_event->event = WM_LBUTTONDOWN;
+          break;
+        case WebMouseEvent::ButtonMiddle:
+          np_event->event = WM_MBUTTONDOWN;
+          break;
+        case WebMouseEvent::ButtonRight:
+          np_event->event = WM_RBUTTONDOWN;
+          break;
+      }
+      return true;
+    case WebInputEvent::MouseUp:
+      switch (event.button) {
+        case WebMouseEvent::ButtonLeft:
+          np_event->event = WM_LBUTTONUP;
+          break;
+        case WebMouseEvent::ButtonMiddle:
+          np_event->event = WM_MBUTTONUP;
+          break;
+        case WebMouseEvent::ButtonRight:
+          np_event->event = WM_RBUTTONUP;
+          break;
+      }
+      return true;
+    default:
+      NOTREACHED();
+      return false;
+  }
+}
+
+static bool NPEventFromWebKeyboardEvent(const WebKeyboardEvent& event,
+                                        NPEvent* np_event) {
+  np_event->wParam = event.windowsKeyCode;
+
+  switch (event.type) {
+    case WebInputEvent::KeyDown:
+      np_event->event = WM_KEYDOWN;
+      np_event->lParam = 0;
+      return true;
+    case WebInputEvent::Char:
+      np_event->event = WM_CHAR;
+      np_event->lParam = 0;
+      return true;
+    case WebInputEvent::KeyUp:
+      np_event->event = WM_KEYUP;
+      np_event->lParam = 0x8000;
+      return true;
+    default:
+      NOTREACHED();
+      return false;
+  }
+}
+
+static bool NPEventFromWebInputEvent(const WebInputEvent& event,
+                                     NPEvent* np_event) {
+  switch (event.type) {
+    case WebInputEvent::MouseMove:
+    case WebInputEvent::MouseLeave:
+    case WebInputEvent::MouseEnter:
+    case WebInputEvent::MouseDown:
+    case WebInputEvent::MouseUp:
+      if (event.size < sizeof(WebMouseEvent)) {
+        NOTREACHED();
+        return false;
+      }
+      return NPEventFromWebMouseEvent(
+          *static_cast<const WebMouseEvent*>(&event), np_event);
+    case WebInputEvent::KeyDown:
+    case WebInputEvent::Char:
+    case WebInputEvent::KeyUp:
+      if (event.size < sizeof(WebKeyboardEvent)) {
+        NOTREACHED();
+        return false;
+      }
+      return NPEventFromWebKeyboardEvent(
+          *static_cast<const WebKeyboardEvent*>(&event), np_event);
+    default:
+      return false;
+  }
+}
+
+bool WebPluginDelegateImpl::PlatformHandleInputEvent(
+    const WebInputEvent& event, WebCursor::CursorInfo* cursor_info) {
+  DCHECK(cursor_info != NULL);
+
+  NPEvent np_event;
+  if (!NPEventFromWebInputEvent(event, &np_event)) {
+    return false;
+  }
+
+  // Allow this plug-in to access this IME emulator through IMM32 API while the
+  // plug-in is processing this event.
+  if (GetQuirks() & PLUGIN_QUIRK_EMULATE_IME) {
+    if (!plugin_ime_)
+      plugin_ime_.reset(new WebPluginIMEWin);
+  }
+  WebPluginIMEWin::ScopedLock lock(
+      event.isKeyboardEventType(event.type) ? plugin_ime_.get() : NULL);
+
+  HWND last_focus_window = NULL;
+
+  if (ShouldTrackEventForModalLoops(&np_event)) {
+    // A windowless plugin can enter a modal loop in a NPP_HandleEvent call.
+    // For e.g. Flash puts up a context menu when we right click on the
+    // windowless plugin area. We detect this by setting up a message filter
+    // hook pror to calling NPP_HandleEvent on the plugin and unhook on
+    // return from NPP_HandleEvent. If the plugin does enter a modal loop
+    // in that context we unhook on receiving the first notification in
+    // the message filter hook.
+    handle_event_message_filter_hook_ =
+        SetWindowsHookEx(WH_MSGFILTER, HandleEventMessageFilterHook, NULL,
+                         GetCurrentThreadId());
+    // To ensure that the plugin receives keyboard events we set focus to the
+    // dummy window.
+    // TODO(iyengar) We need a framework in the renderer to identify which
+    // windowless plugin is under the mouse and to handle this. This would
+    // also require some changes in RenderWidgetHost to detect this in the
+    // WM_MOUSEACTIVATE handler and inform the renderer accordingly.
+    bool valid = GetParent(dummy_window_for_activation_) != GetDesktopWindow();
+    if (valid) {
+      last_focus_window = ::SetFocus(dummy_window_for_activation_);
+    } else {
+      NOTREACHED() << "Dummy window not parented";
+    }
+  }
+
+  bool old_task_reentrancy_state =
+      base::MessageLoop::current()->NestableTasksAllowed();
+
+  // Maintain a local/global stack for the g_current_plugin_instance variable
+  // as this may be a nested invocation.
+  WebPluginDelegateImpl* last_plugin_instance = g_current_plugin_instance;
+
+  g_current_plugin_instance = this;
+
+  handle_event_depth_++;
+
+  bool popups_enabled = false;
+
+  if (IsUserGestureMessage(np_event.event)) {
+    instance()->PushPopupsEnabledState(true);
+    popups_enabled = true;
+  }
+
+  bool ret = instance()->NPP_HandleEvent(&np_event) != 0;
+
+  if (popups_enabled) {
+    instance()->PopPopupsEnabledState();
+  }
+
+  // Flash and SilverLight always return false, even when they swallow the
+  // event.  Flash does this because it passes the event to its window proc,
+  // which is supposed to return 0 if an event was handled.  There are few
+  // exceptions, such as IME, where it sometimes returns true.
+  ret = true;
+
+  if (np_event.event == WM_MOUSEMOVE) {
+    current_windowless_cursor_.InitFromExternalCursor(GetCursor());
+    // Snag a reference to the current cursor ASAP in case the plugin modified
+    // it. There is a nasty race condition here with the multiprocess browser
+    // as someone might be setting the cursor in the main process as well.
+    current_windowless_cursor_.GetCursorInfo(cursor_info);
+  }
+
+  handle_event_depth_--;
+
+  g_current_plugin_instance = last_plugin_instance;
+
+  // We could have multiple NPP_HandleEvent calls nested together in case
+  // the plugin enters a modal loop. Reset the pump messages event when
+  // the outermost NPP_HandleEvent call unwinds.
+  if (handle_event_depth_ == 0) {
+    ResetEvent(handle_event_pump_messages_event_);
+  }
+
+  if (::IsWindow(last_focus_window)) {
+    // Restore the nestable tasks allowed state in the message loop and reset
+    // the os modal loop state as the plugin returned from the TrackPopupMenu
+    // API call.
+    base::MessageLoop::current()->SetNestableTasksAllowed(
+        old_task_reentrancy_state);
+    base::MessageLoop::current()->set_os_modal_loop(false);
+    // The Flash plugin at times sets focus to its hidden top level window
+    // with class name SWFlash_PlaceholderX. This causes the chrome browser
+    // window to receive a WM_ACTIVATEAPP message as a top level window from
+    // another thread is now active. We end up in a state where the chrome
+    // browser window is not active even though the user clicked on it.
+    // Our workaround for this is to send over a raw
+    // WM_LBUTTONDOWN/WM_LBUTTONUP combination to the last focus window, which
+    // does the trick.
+    if (dummy_window_for_activation_ != ::GetFocus()) {
+      INPUT input_info = {0};
+      input_info.type = INPUT_MOUSE;
+      input_info.mi.dwFlags = MOUSEEVENTF_LEFTDOWN;
+      ::SendInput(1, &input_info, sizeof(INPUT));
+
+      input_info.type = INPUT_MOUSE;
+      input_info.mi.dwFlags = MOUSEEVENTF_LEFTUP;
+      ::SendInput(1, &input_info, sizeof(INPUT));
+    } else {
+      ::SetFocus(last_focus_window);
+    }
+  }
+  return ret;
+}
+
+
+void WebPluginDelegateImpl::OnModalLoopEntered() {
+  DCHECK(handle_event_pump_messages_event_ != NULL);
+  SetEvent(handle_event_pump_messages_event_);
+
+  base::MessageLoop::current()->SetNestableTasksAllowed(true);
+  base::MessageLoop::current()->set_os_modal_loop(true);
+
+  UnhookWindowsHookEx(handle_event_message_filter_hook_);
+  handle_event_message_filter_hook_ = NULL;
+}
+
+bool WebPluginDelegateImpl::ShouldTrackEventForModalLoops(NPEvent* event) {
+  if (event->event == WM_RBUTTONDOWN)
+    return true;
+  return false;
+}
+
+void WebPluginDelegateImpl::OnUserGestureEnd() {
+  user_gesture_message_posted_ = false;
+  instance()->PopPopupsEnabledState();
+}
+
+BOOL WINAPI WebPluginDelegateImpl::TrackPopupMenuPatch(
+    HMENU menu, unsigned int flags, int x, int y, int reserved,
+    HWND window, const RECT* rect) {
+
+  if (g_current_plugin_instance) {
+    unsigned long window_process_id = 0;
+    unsigned long window_thread_id =
+        GetWindowThreadProcessId(window, &window_process_id);
+    // TrackPopupMenu fails if the window passed in belongs to a different
+    // thread.
+    if (::GetCurrentThreadId() != window_thread_id) {
+      bool valid =
+          GetParent(g_current_plugin_instance->dummy_window_for_activation_) !=
+              GetDesktopWindow();
+      if (valid) {
+        window = g_current_plugin_instance->dummy_window_for_activation_;
+      } else {
+        NOTREACHED() << "Dummy window not parented";
+      }
+    }
+  }
+
+  BOOL result = TrackPopupMenu(menu, flags, x, y, reserved, window, rect);
+  return result;
+}
+
+HCURSOR WINAPI WebPluginDelegateImpl::SetCursorPatch(HCURSOR cursor) {
+  // The windowless flash plugin periodically calls SetCursor in a wndproc
+  // instantiated on the plugin thread. This causes annoying cursor flicker
+  // when the mouse is moved on a foreground tab, with a windowless plugin
+  // instance in a background tab. We just ignore the call here.
+  if (!g_current_plugin_instance) {
+    HCURSOR current_cursor = GetCursor();
+    if (current_cursor != cursor) {
+      ::SetCursor(cursor);
+    }
+    return current_cursor;
+  }
+  return ::SetCursor(cursor);
+}
+
+LONG WINAPI WebPluginDelegateImpl::RegEnumKeyExWPatch(
+    HKEY key, DWORD index, LPWSTR name, LPDWORD name_size, LPDWORD reserved,
+    LPWSTR class_name, LPDWORD class_size, PFILETIME last_write_time) {
+  DWORD orig_size = *name_size;
+  LONG rv = RegEnumKeyExW(key, index, name, name_size, reserved, class_name,
+                          class_size, last_write_time);
+  if (rv == ERROR_SUCCESS &&
+      GetKeyPath(key).find(L"Microsoft\\MediaPlayer\\ShimInclusionList") !=
+          std::wstring::npos) {
+    static const wchar_t kChromeExeName[] = L"chrome.exe";
+    wcsncpy_s(name, orig_size, kChromeExeName, arraysize(kChromeExeName));
+    *name_size =
+        std::min(orig_size, static_cast<DWORD>(arraysize(kChromeExeName)));
+  }
+
+  return rv;
+}
+
+void WebPluginDelegateImpl::ImeCompositionUpdated(
+    const base::string16& text,
+    const std::vector<int>& clauses,
+    const std::vector<int>& target,
+    int cursor_position) {
+  if (!plugin_ime_)
+    plugin_ime_.reset(new WebPluginIMEWin);
+
+  plugin_ime_->CompositionUpdated(text, clauses, target, cursor_position);
+  plugin_ime_->SendEvents(instance());
+}
+
+void WebPluginDelegateImpl::ImeCompositionCompleted(
+    const base::string16& text) {
+  if (!plugin_ime_)
+    plugin_ime_.reset(new WebPluginIMEWin);
+  plugin_ime_->CompositionCompleted(text);
+  plugin_ime_->SendEvents(instance());
+}
+
+bool WebPluginDelegateImpl::GetIMEStatus(int* input_type,
+                                         gfx::Rect* caret_rect) {
+  if (!plugin_ime_)
+    return false;
+  return plugin_ime_->GetStatus(input_type, caret_rect);
+}
+
+// static
+FARPROC WINAPI WebPluginDelegateImpl::GetProcAddressPatch(HMODULE module,
+                                                          LPCSTR name) {
+  FARPROC imm_function = WebPluginIMEWin::GetProcAddress(name);
+  if (imm_function)
+    return imm_function;
+  return ::GetProcAddress(module, name);
+}
+
+void WebPluginDelegateImpl::HandleCaptureForMessage(HWND window,
+                                                    UINT message) {
+  if (ui::GetClassName(window) != base::string16(kNativeWindowClassName))
+    return;
+
+  switch (message) {
+    case WM_LBUTTONDOWN:
+    case WM_MBUTTONDOWN:
+    case WM_RBUTTONDOWN:
+      ::SetCapture(window);
+      // As per documentation the WM_PARENTNOTIFY message is sent to the parent
+      // window chain if mouse input is received by the child window. However
+      // the parent receives the WM_PARENTNOTIFY message only if we doubleclick
+      // on the window. We send the WM_PARENTNOTIFY message for mouse input
+      // messages to the parent to indicate that user action is expected.
+      ::SendMessage(::GetParent(window), WM_PARENTNOTIFY, message, 0);
+      break;
+
+    case WM_LBUTTONUP:
+    case WM_MBUTTONUP:
+    case WM_RBUTTONUP:
+      ::ReleaseCapture();
+      break;
+
+    default:
+      break;
+  }
+}
+
+}  // namespace content