Introduce a user scripts mechanism

Allowing programmatic injection of JavaScript to accomplish
all sorts of tasks on the render process side.
This API gives control over the point during the loading phase
at which the script is run, whether it is run on sub-frames or
not, as well as the JavaScript world it is run in (either the
page's main world, or an arbitrary isolated world).

This only has the Widgets API. The Quick API, tests and docs
are coming in separate patches

Change-Id: Ia1c79f68f8dfd4d964281d9723d09062ed7abe46
Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>

16 files changed, 1069 insertions, 9 deletions

diff --git a/src/core/browser_context_adapter.cpp b/src/core/browser_context_adapter.cpp
index 1749fc708..f89e671c7 100644
--- a/src/core/browser_context_adapter.cpp
+++ b/src/core/browser_context_adapter.cpp
@@ -43,6 +43,7 @@
 #include "web_engine_context.h"
 #include "web_engine_visited_links_manager.h"
 #include "url_request_context_getter_qt.h"
+#include "user_script_controller_host.h"
 
 #include "net/proxy/proxy_service.h"
 
@@ -325,3 +326,10 @@ void BrowserContextAdapter::updateCustomUrlSchemeHandlers()
     if (m_browserContext->url_request_getter_.get())
         m_browserContext->url_request_getter_->updateStorageSettings();
 }
+
+UserScriptControllerHost *BrowserContextAdapter::userScriptController()
+{
+    if (!m_userScriptController)
+        m_userScriptController.reset(new UserScriptControllerHost);
+    return m_userScriptController.data();
+}
diff --git a/src/core/browser_context_adapter.h b/src/core/browser_context_adapter.h
index 6389d666c..2a7c3465f 100644
--- a/src/core/browser_context_adapter.h
+++ b/src/core/browser_context_adapter.h
@@ -48,6 +48,7 @@ class BrowserContextAdapterClient;
 class BrowserContextQt;
 class CustomUrlSchemeHandler;
 class DownloadManagerDelegateQt;
+class UserScriptControllerHost;
 class WebEngineVisitedLinksManager;
 
 class QWEBENGINE_EXPORT BrowserContextAdapter : public QSharedData
@@ -123,6 +124,7 @@ public:
 
     QVector<CustomUrlSchemeHandler*> &customUrlSchemeHandlers();
     void updateCustomUrlSchemeHandlers();
+    UserScriptControllerHost *userScriptController();
 
 private:
     QString m_name;
@@ -130,6 +132,8 @@ private:
     QScopedPointer<BrowserContextQt> m_browserContext;
     QScopedPointer<WebEngineVisitedLinksManager> m_visitedLinksManager;
     QScopedPointer<DownloadManagerDelegateQt> m_downloadManagerDelegate;
+    QScopedPointer<UserScriptControllerHost> m_userScriptController;
+
     QString m_dataPath;
     QString m_cachePath;
     QString m_httpUserAgent;
diff --git a/src/core/browser_context_qt.h b/src/core/browser_context_qt.h
index 2798cc52f..fb94ddf06 100644
--- a/src/core/browser_context_qt.h
+++ b/src/core/browser_context_qt.h
@@ -73,6 +73,8 @@ public:
 
     BrowserContextAdapter* adapter() { return m_adapter; }
 private:
+    friend class ContentBrowserClientQt;
+    friend class WebContentsAdapter;
     scoped_ptr<content::ResourceContext> resourceContext;
     scoped_refptr<URLRequestContextGetterQt> url_request_getter_;
     BrowserContextAdapter *m_adapter;
diff --git a/src/core/common/qt_messages.h b/src/core/common/qt_messages.h
index 5ae5fef7d..c692ee5ca 100644
--- a/src/core/common/qt_messages.h
+++ b/src/core/common/qt_messages.h
@@ -3,19 +3,21 @@
 // found in the LICENSE file.
 
 // Multiply-included file, no traditional include guard.
-#include "ipc/ipc_message_macros.h"
-
-// Singly-included section for enums and custom IPC traits.
-#ifndef RENDER_VIEW_MESSAGES_H
-#define RENDER_VIEW_MESSAGES_H
 
-namespace IPC {
+#include "content/public/common/common_param_traits.h"
+#include "ipc/ipc_message_macros.h"
 
-// TODO - add enums and custom IPC traits here when needed.
+#include "user_script_data.h"
 
-}  // namespace IPC
+IPC_STRUCT_TRAITS_BEGIN(UserScriptData)
+    IPC_STRUCT_TRAITS_MEMBER(source)
+    IPC_STRUCT_TRAITS_MEMBER(url)
+    IPC_STRUCT_TRAITS_MEMBER(injectionPoint)
+    IPC_STRUCT_TRAITS_MEMBER(injectForSubframes)
+    IPC_STRUCT_TRAITS_MEMBER(worldId)
+    IPC_STRUCT_TRAITS_MEMBER(scriptId)
+IPC_STRUCT_TRAITS_END()
 
-#endif  // RENDER_VIEW_MESSAGES_H
 
 #define IPC_MESSAGE_START QtMsgStart
 
@@ -31,6 +33,17 @@ IPC_MESSAGE_ROUTED1(QtRenderViewObserver_FetchDocumentInnerText,
 
 IPC_MESSAGE_ROUTED1(WebChannelIPCTransport_Message, std::vector<char> /*binaryJSON*/)
 
+// User scripts messages
+IPC_MESSAGE_ROUTED1(RenderViewObserverHelper_AddScript,
+                    UserScriptData /* script */)
+IPC_MESSAGE_ROUTED1(RenderViewObserverHelper_RemoveScript,
+                    UserScriptData /* script */)
+IPC_MESSAGE_ROUTED0(RenderViewObserverHelper_ClearScripts)
+
+IPC_MESSAGE_CONTROL1(UserScriptController_AddScript, UserScriptData /* scriptContents */)
+IPC_MESSAGE_CONTROL1(UserScriptController_RemoveScript, UserScriptData /* scriptContents */)
+IPC_MESSAGE_CONTROL0(UserScriptController_ClearScripts)
+
 //-----------------------------------------------------------------------------
 // WebContents messages
 // These are messages sent from the renderer back to the browser process.
diff --git a/src/core/common/user_script_data.cpp b/src/core/common/user_script_data.cpp
new file mode 100644
index 000000000..f94ea640c
--- /dev/null
+++ b/src/core/common/user_script_data.cpp
@@ -0,0 +1,46 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "user_script_data.h"
+#include "base/pickle.h"
+
+UserScriptData::UserScriptData() : injectionPoint(AfterLoad)
+  , injectForSubframes(false)
+  , worldId(1)
+{
+    static uint64 idCount = 0;
+    scriptId = idCount++;
+}
diff --git a/src/core/common/user_script_data.h b/src/core/common/user_script_data.h
new file mode 100644
index 000000000..3dfec0ec3
--- /dev/null
+++ b/src/core/common/user_script_data.h
@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef USER_SCRIPT_DATA_H
+#define USER_SCRIPT_DATA_H
+
+#include <QtCore/QHash>
+#include <string>
+#include "base/basictypes.h"
+#include "ipc/ipc_message_utils.h"
+#include "url/gurl.h"
+
+struct UserScriptData {
+    enum InjectionPoint {
+        AfterLoad,
+        DocumentLoadFinished,
+        DocumentElementCreation
+    };
+
+    UserScriptData();
+
+    std::string source;
+    GURL url;
+    /*InjectionPoint*/uint8 injectionPoint;
+    bool injectForSubframes;
+    uint worldId;
+    uint64 scriptId;
+};
+
+#endif // USER_SCRIPT_DATA_H
diff --git a/src/core/content_browser_client_qt.cpp b/src/core/content_browser_client_qt.cpp
index 8fb6acf62..8d2541495 100644
--- a/src/core/content_browser_client_qt.cpp
+++ b/src/core/content_browser_client_qt.cpp
@@ -56,6 +56,7 @@
 #include "ui/gl/gl_share_group.h"
 
 #include "access_token_store_qt.h"
+#include "browser_context_adapter.h"
 #include "browser_context_qt.h"
 #include "certificate_error_controller.h"
 #include "certificate_error_controller_p.h"
@@ -66,6 +67,7 @@
 #endif
 #include "media_capture_devices_dispatcher.h"
 #include "resource_dispatcher_host_delegate_qt.h"
+#include "user_script_controller_host.h"
 #include "web_contents_delegate_qt.h"
 #include "access_token_store_qt.h"
 
@@ -329,6 +331,7 @@ void ContentBrowserClientQt::RenderProcessWillLaunch(content::RenderProcessHost*
 {
     // FIXME: Add a settings variable to enable/disable the file scheme.
     content::ChildProcessSecurityPolicy::GetInstance()->GrantScheme(host->GetID(), url::kFileScheme);
+    static_cast<BrowserContextQt*>(host->GetBrowserContext())->m_adapter->userScriptController()->renderProcessHostCreated(host);
 }
 
 void ContentBrowserClientQt::ResourceDispatcherHostCreated()
diff --git a/src/core/core_gyp_generator.pro b/src/core/core_gyp_generator.pro
index b93ea0175..b5722d2d3 100644
--- a/src/core/core_gyp_generator.pro
+++ b/src/core/core_gyp_generator.pro
@@ -38,6 +38,7 @@ SOURCES = \
         chromium_overrides.cpp \
         clipboard_qt.cpp \
         common/qt_messages.cpp \
+        common/user_script_data.cpp \
         content_client_qt.cpp \
         content_browser_client_qt.cpp \
         content_main_delegate_qt.cpp \
@@ -61,6 +62,7 @@ SOURCES = \
         render_widget_host_view_qt.cpp \
         renderer/content_renderer_client_qt.cpp \
         renderer/qt_render_view_observer.cpp \
+        renderer/user_script_controller.cpp \
         renderer/web_channel_ipc_transport.cpp \
         resource_bundle_qt.cpp \
         resource_context_qt.cpp \
@@ -71,6 +73,8 @@ SOURCES = \
         url_request_custom_job.cpp \
         url_request_custom_job_delegate.cpp \
         url_request_qrc_job_qt.cpp \
+        user_script.cpp \
+        user_script_controller_host.cpp \
         web_channel_ipc_transport_host.cpp \
         web_contents_adapter.cpp \
         web_contents_delegate_qt.cpp \
@@ -95,6 +99,7 @@ HEADERS = \
         chromium_overrides.h \
         clipboard_qt.h \
         common/qt_messages.h \
+        common/user_script_data.h \
         content_client_qt.h \
         content_browser_client_qt.h \
         content_main_delegate_qt.h \
@@ -120,6 +125,7 @@ HEADERS = \
         render_widget_host_view_qt_delegate.h \
         renderer/content_renderer_client_qt.h \
         renderer/qt_render_view_observer.h \
+        renderer/user_script_controller.h \
         renderer/web_channel_ipc_transport.h \
         resource_context_qt.h \
         resource_dispatcher_host_delegate_qt.h \
@@ -130,6 +136,8 @@ HEADERS = \
         url_request_custom_job.h \
         url_request_custom_job_delegate.h \
         url_request_qrc_job_qt.h \
+        user_script.h \
+        user_script_controller_host.h \
         web_channel_ipc_transport_host.h \
         web_contents_adapter.h \
         web_contents_adapter_client.h \
diff --git a/src/core/renderer/content_renderer_client_qt.cpp b/src/core/renderer/content_renderer_client_qt.cpp
index bde8e8455..242c8ef6d 100644
--- a/src/core/renderer/content_renderer_client_qt.cpp
+++ b/src/core/renderer/content_renderer_client_qt.cpp
@@ -52,6 +52,7 @@
 
 #include "renderer/web_channel_ipc_transport.h"
 #include "renderer/qt_render_view_observer.h"
+#include "renderer/user_script_controller.h"
 
 #include "grit/renderer_resources.h"
 
@@ -71,6 +72,7 @@ void ContentRendererClientQt::RenderThreadStarted()
     renderThread->RegisterExtension(WebChannelIPCTransport::getV8Extension());
     m_visitedLinkSlave.reset(new visitedlink::VisitedLinkSlave);
     renderThread->AddObserver(m_visitedLinkSlave.data());
+    renderThread->AddObserver(UserScriptController::instance());
 }
 
 void ContentRendererClientQt::RenderViewCreated(content::RenderView* render_view)
@@ -78,6 +80,7 @@ void ContentRendererClientQt::RenderViewCreated(content::RenderView* render_view
     // RenderViewObservers destroy themselves with their RenderView.
     new QtRenderViewObserver(render_view);
     new WebChannelIPCTransport(render_view);
+    UserScriptController::instance()->renderViewCreated(render_view);
 }
 
 bool ContentRendererClientQt::HasErrorPage(int httpStatusCode, std::string *errorDomain)
diff --git a/src/core/renderer/user_script_controller.cpp b/src/core/renderer/user_script_controller.cpp
new file mode 100644
index 000000000..729500341
--- /dev/null
+++ b/src/core/renderer/user_script_controller.cpp
@@ -0,0 +1,259 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "user_script_controller.h"
+
+#include "content/public/renderer/render_view.h"
+#include "content/public/renderer/render_view_observer.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebScriptSource.h"
+#include "third_party/WebKit/public/web/WebView.h"
+#include "v8/include/v8.h"
+
+#include "common/qt_messages.h"
+#include "common/user_script_data.h"
+
+Q_GLOBAL_STATIC(UserScriptController, qt_webengine_userScriptController)
+
+static content::RenderView * const globalScriptsIndex = 0;
+
+// Scripts meant to run after the load event will be run 500ms after DOMContentLoaded if the load event doesn't come within that delay.
+static const int afterLoadTimeout = 500;
+
+class UserScriptController::RenderViewObserverHelper : public content::RenderViewObserver
+{
+public:
+    RenderViewObserverHelper(content::RenderView *);
+private:
+    // RenderViewObserver implementation.
+    virtual void DidCreateDocumentElement(blink::WebLocalFrame* frame) Q_DECL_OVERRIDE;
+    virtual void DidFinishDocumentLoad(blink::WebLocalFrame* frame) Q_DECL_OVERRIDE;
+    virtual void DidFinishLoad(blink::WebLocalFrame* frame) Q_DECL_OVERRIDE;
+    virtual void DidStartProvisionalLoad(blink::WebLocalFrame* frame) Q_DECL_OVERRIDE;
+    virtual void FrameDetached(blink::WebFrame* frame) Q_DECL_OVERRIDE;
+    virtual void OnDestruct() Q_DECL_OVERRIDE;
+    virtual bool OnMessageReceived(const IPC::Message& message) Q_DECL_OVERRIDE;
+
+    void onUserScriptAdded(const UserScriptData &);
+    void onUserScriptRemoved(const UserScriptData &);
+    void onScriptsCleared();
+
+    void runScripts(UserScriptData::InjectionPoint, blink::WebLocalFrame *);
+    QSet<blink::WebLocalFrame *> m_pendingFrames;
+};
+
+void UserScriptController::RenderViewObserverHelper::runScripts(UserScriptData::InjectionPoint p, blink::WebLocalFrame *frame)
+{
+    if (p == UserScriptData::AfterLoad && !m_pendingFrames.remove(frame))
+        return;
+    content::RenderView *renderView = content::RenderView::FromWebView(frame->view());
+    const bool isMainFrame = (frame == renderView->GetWebView()->mainFrame());
+
+    QList<uint64> scriptsToRun = UserScriptController::instance()->m_viewUserScriptMap.value(globalScriptsIndex).toList();
+    scriptsToRun.append(UserScriptController::instance()->m_viewUserScriptMap.value(renderView).toList());
+
+    Q_FOREACH (uint64 id, scriptsToRun) {
+        const UserScriptData &script = UserScriptController::instance()->m_scripts.value(id);
+        if (script.injectionPoint != p
+                || (!script.injectForSubframes && !isMainFrame))
+            continue;
+        blink::WebScriptSource source(blink::WebString::fromUTF8(script.source), script.url);
+        if (script.worldId)
+            frame->executeScriptInIsolatedWorld(script.worldId, &source, /*numSources = */1, /*contentScriptExtentsionGroup = */ 1);
+        else
+            frame->executeScript(source);
+    }
+}
+
+
+UserScriptController::RenderViewObserverHelper::RenderViewObserverHelper(content::RenderView *renderView)
+    : content::RenderViewObserver(renderView)
+{
+}
+
+void UserScriptController::RenderViewObserverHelper::DidCreateDocumentElement(blink::WebLocalFrame *frame)
+{
+    runScripts(UserScriptData::DocumentElementCreation, frame);
+}
+
+void UserScriptController::RenderViewObserverHelper::DidFinishDocumentLoad(blink::WebLocalFrame *frame)
+{
+    runScripts(UserScriptData::DocumentLoadFinished, frame);
+    m_pendingFrames.insert(frame);
+    base::MessageLoop::current()->PostDelayedTask(FROM_HERE, base::Bind(&UserScriptController::RenderViewObserverHelper::runScripts,
+                                                                        base::Unretained(this), UserScriptData::AfterLoad, frame),
+                                                  base::TimeDelta::FromMilliseconds(afterLoadTimeout));
+}
+
+void UserScriptController::RenderViewObserverHelper::DidFinishLoad(blink::WebLocalFrame *frame)
+{
+    // DidFinishDocumentLoad always comes before this, so frame has already been marked as pending.
+    base::MessageLoop::current()->PostTask(FROM_HERE, base::Bind(&UserScriptController::RenderViewObserverHelper::runScripts,
+                                                                 base::Unretained(this), UserScriptData::AfterLoad, frame));
+}
+
+void UserScriptController::RenderViewObserverHelper::DidStartProvisionalLoad(blink::WebLocalFrame *frame)
+{
+    m_pendingFrames.remove(frame);
+}
+
+void UserScriptController::RenderViewObserverHelper::FrameDetached(blink::WebFrame *frame)
+{
+    if (frame->isWebLocalFrame())
+        m_pendingFrames.remove(frame->toWebLocalFrame());
+}
+
+void UserScriptController::RenderViewObserverHelper::OnDestruct()
+{
+    UserScriptController::instance()->renderViewDestroyed(render_view());
+}
+
+bool UserScriptController::RenderViewObserverHelper::OnMessageReceived(const IPC::Message &message)
+{
+    bool handled = true;
+    IPC_BEGIN_MESSAGE_MAP(UserScriptController::RenderViewObserverHelper, message)
+        IPC_MESSAGE_HANDLER(RenderViewObserverHelper_AddScript, onUserScriptAdded)
+        IPC_MESSAGE_HANDLER(RenderViewObserverHelper_RemoveScript, onUserScriptRemoved)
+        IPC_MESSAGE_HANDLER(RenderViewObserverHelper_ClearScripts, onScriptsCleared)
+        IPC_MESSAGE_UNHANDLED(handled = false)
+    IPC_END_MESSAGE_MAP()
+            return handled;
+}
+
+void UserScriptController::RenderViewObserverHelper::onUserScriptAdded(const UserScriptData &script)
+{
+    UserScriptController::instance()->addScriptForView(script, render_view());
+}
+
+void UserScriptController::RenderViewObserverHelper::onUserScriptRemoved(const UserScriptData &script)
+{
+    UserScriptController::instance()->removeScriptForView(script, render_view());
+}
+
+void UserScriptController::RenderViewObserverHelper::onScriptsCleared()
+{
+    UserScriptController::instance()->clearScriptsForView(render_view());
+}
+
+UserScriptController *UserScriptController::instance()
+{
+    return qt_webengine_userScriptController();
+}
+
+bool UserScriptController::OnControlMessageReceived(const IPC::Message &message)
+{
+    bool handled = true;
+    IPC_BEGIN_MESSAGE_MAP(UserScriptController, message)
+        IPC_MESSAGE_HANDLER(UserScriptController_AddScript, onAddScript)
+        IPC_MESSAGE_HANDLER(UserScriptController_RemoveScript, onRemoveScript)
+        IPC_MESSAGE_HANDLER(UserScriptController_ClearScripts, onClearScripts)
+        IPC_MESSAGE_UNHANDLED(handled = false)
+    IPC_END_MESSAGE_MAP()
+    return handled;
+}
+
+UserScriptController::UserScriptController()
+{
+#if !defined(QT_NO_DEBUG) || defined(QT_FORCE_ASSERTS)
+    static bool onlyCalledOnce = true;
+    Q_ASSERT(onlyCalledOnce);
+    onlyCalledOnce = false;
+#endif // !defined(QT_NO_DEBUG) || defined(QT_FORCE_ASSERTS)
+}
+
+void UserScriptController::renderViewCreated(content::RenderView *renderView)
+{
+    // Will destroy itself with their RenderView.
+    new RenderViewObserverHelper(renderView);
+}
+
+void UserScriptController::renderViewDestroyed(content::RenderView *renderView)
+{
+    ViewUserScriptMap::iterator it = m_viewUserScriptMap.find(renderView);
+    if (it == m_viewUserScriptMap.end()) // ASSERT maybe?
+        return;
+    Q_FOREACH (uint64 id, it.value()) {
+        m_scripts.remove(id);
+    }
+    m_viewUserScriptMap.remove(renderView);
+}
+
+void UserScriptController::addScriptForView(const UserScriptData &script, content::RenderView *view)
+{
+    ViewUserScriptMap::iterator it = m_viewUserScriptMap.find(view);
+    if (it == m_viewUserScriptMap.end())
+        it = m_viewUserScriptMap.insert(view, UserScriptSet());
+
+    (*it).insert(script.scriptId);
+    m_scripts.insert(script.scriptId, script);
+}
+
+void UserScriptController::removeScriptForView(const UserScriptData &script, content::RenderView *view)
+{
+    ViewUserScriptMap::iterator it = m_viewUserScriptMap.find(view);
+    if (it == m_viewUserScriptMap.end())
+        return;
+
+    (*it).remove(script.scriptId);
+    m_scripts.remove(script.scriptId);
+}
+
+void UserScriptController::clearScriptsForView(content::RenderView *view)
+{
+    ViewUserScriptMap::iterator it = m_viewUserScriptMap.find(view);
+    if (it == m_viewUserScriptMap.end())
+        return;
+    Q_FOREACH (uint64 id, it.value())
+        m_scripts.remove(id);
+
+    m_viewUserScriptMap.remove(view);
+}
+
+void UserScriptController::onAddScript(const UserScriptData &script)
+{
+    addScriptForView(script, globalScriptsIndex);
+}
+
+void UserScriptController::onRemoveScript(const UserScriptData &script)
+{
+    removeScriptForView(script, globalScriptsIndex);
+}
+
+void UserScriptController::onClearScripts()
+{
+    clearScriptsForView(globalScriptsIndex);
+}
+
diff --git a/src/core/renderer/user_script_controller.h b/src/core/renderer/user_script_controller.h
new file mode 100644
index 000000000..ed83d9dac
--- /dev/null
+++ b/src/core/renderer/user_script_controller.h
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef USER_SCRIPT_CONTROLLER_H
+#define USER_SCRIPT_CONTROLLER_H
+
+#include "content/public/renderer/render_process_observer.h"
+
+#include "common/user_script_data.h"
+
+#include <QtCore/qcompilerdetection.h>
+#include <QtCore/QHash>
+#include <QtCore/QSet>
+
+namespace content {
+class RenderView;
+}
+
+
+class UserScriptController : public content::RenderProcessObserver {
+
+public:
+    static UserScriptController *instance();
+    UserScriptController();
+    void renderViewCreated(content::RenderView *);
+    void renderViewDestroyed(content::RenderView *);
+    void addScriptForView(const UserScriptData &, content::RenderView *);
+    void removeScriptForView(const UserScriptData &, content::RenderView *);
+    void clearScriptsForView(content::RenderView *);
+
+private:
+    Q_DISABLE_COPY(UserScriptController)
+
+    class RenderViewObserverHelper;
+
+    // RenderProcessObserver implementation.
+    virtual bool OnControlMessageReceived(const IPC::Message &message) Q_DECL_OVERRIDE;
+
+    void onAddScript(const UserScriptData &);
+    void onRemoveScript(const UserScriptData &);
+    void onClearScripts();
+
+    typedef QSet<uint64> UserScriptSet;
+    typedef QHash<const content::RenderView *, UserScriptSet> ViewUserScriptMap;
+    ViewUserScriptMap m_viewUserScriptMap;
+    QHash<uint64, UserScriptData> m_scripts;
+};
+
+#endif // USER_SCRIPT_CONTROLLER_H
diff --git a/src/core/user_script.cpp b/src/core/user_script.cpp
new file mode 100644
index 000000000..7e88f9223
--- /dev/null
+++ b/src/core/user_script.cpp
@@ -0,0 +1,185 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "common/user_script_data.h"
+#include "user_script.h"
+#include "user_script_controller_host.h"
+#include "type_conversion.h"
+
+ASSERT_ENUMS_MATCH(UserScript::AfterLoad, UserScriptData::AfterLoad)
+ASSERT_ENUMS_MATCH(UserScript::DocumentLoadFinished, UserScriptData::DocumentLoadFinished)
+ASSERT_ENUMS_MATCH(UserScript::DocumentElementCreation, UserScriptData::DocumentElementCreation)
+
+UserScript::UserScript()
+    : QSharedData()
+{
+}
+
+UserScript::UserScript(const UserScript &other)
+    : QSharedData(other)
+{
+    if (other.isNull())
+        return;
+    scriptData.reset(new UserScriptData);
+    m_name = other.m_name;
+    scriptData->source = other.scriptData->source;
+    scriptData->url = other.scriptData->url;
+    scriptData->injectionPoint = other.scriptData->injectionPoint;
+    scriptData->injectForSubframes = other.scriptData->injectForSubframes;
+    scriptData->worldId = other.scriptData->worldId;
+}
+
+UserScript::~UserScript()
+{
+}
+
+UserScript &UserScript::operator=(const UserScript &other)
+{
+    if (other.isNull()) {
+        scriptData.reset();
+        m_name = QString();
+        return *this;
+    }
+    scriptData.reset(new UserScriptData);
+    m_name = other.m_name;
+    scriptData->source = other.scriptData->source;
+    scriptData->url = other.scriptData->url;
+    scriptData->injectionPoint = other.scriptData->injectionPoint;
+    scriptData->injectForSubframes = other.scriptData->injectForSubframes;
+    scriptData->worldId = other.scriptData->worldId;
+    return *this;
+}
+
+QString UserScript::name() const
+{
+    return m_name;
+}
+
+void UserScript::setName(const QString &name)
+{
+    m_name = name;
+    initData();
+    scriptData->url = GURL(QStringLiteral("userScript:%1").arg(name).toStdString());
+}
+
+QString UserScript::source() const
+{
+    if (isNull())
+        return QString();
+    return toQt(scriptData->source);
+}
+
+void UserScript::setSource(const QString &source)
+{
+    initData();
+    scriptData->source = source.toStdString();
+}
+
+UserScript::InjectionPoint UserScript::injectionPoint() const
+{
+    if (isNull())
+        return UserScript::AfterLoad;
+    return static_cast<UserScript::InjectionPoint>(scriptData->injectionPoint);
+}
+
+void UserScript::setInjectionPoint(UserScript::InjectionPoint p)
+{
+    initData();
+    scriptData->injectionPoint = p;
+}
+
+uint UserScript::worldId() const
+{
+    if (isNull())
+        return 1;
+    return scriptData->worldId;
+}
+
+void UserScript::setWorldId(uint id)
+{
+    initData();
+    scriptData->worldId = id;
+}
+
+bool UserScript::runsOnSubFrames() const
+{
+    if (isNull())
+        return false;
+    return scriptData->injectForSubframes;
+}
+
+void UserScript::setRunsOnSubFrames(bool on)
+{
+    initData();
+    scriptData->injectForSubframes = on;
+}
+
+bool UserScript::operator==(const UserScript &other) const
+{
+    if (isNull() != other.isNull())
+        return false;
+    if (isNull()) // neither is valid
+        return true;
+    return worldId() == other.worldId()
+            && runsOnSubFrames() == other.runsOnSubFrames()
+            && injectionPoint() == other.injectionPoint()
+            && name() == other.name() && source() == other.source();
+}
+
+void UserScript::initData()
+{
+    if (scriptData.isNull())
+        scriptData.reset(new UserScriptData);
+}
+
+bool UserScript::isNull() const
+{
+    return scriptData.isNull();
+}
+
+UserScriptData &UserScript::data() const
+{
+    return *(scriptData.data());
+}
+
+uint qHash(const UserScript &script, uint seed)
+{
+    if (script.isNull())
+        return 0;
+    return qHash(script.source(), seed) ^ qHash(script.name(), seed)
+           ^ (script.injectionPoint() | (script.runsOnSubFrames() << 4))
+           ^ script.worldId();
+}
diff --git a/src/core/user_script.h b/src/core/user_script.h
new file mode 100644
index 000000000..17de212ea
--- /dev/null
+++ b/src/core/user_script.h
@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef USER_SCRIPT_H
+#define USER_SCRIPT_H
+
+#include "qtwebenginecoreglobal.h"
+
+#include <QtCore/QAtomicInt>
+#include <QtCore/QScopedPointer>
+#include <QtCore/QSharedData>
+#include <QtCore/QString>
+
+class UserScriptControllerHost;
+struct UserScriptData;
+
+class QWEBENGINE_EXPORT UserScript : public QSharedData {
+public:
+    enum InjectionPoint {
+        AfterLoad,
+        DocumentLoadFinished,
+        DocumentElementCreation
+    };
+
+    UserScript();
+    UserScript(const UserScript &other);
+    ~UserScript();
+    UserScript &operator=(const UserScript &other);
+
+    bool isNull() const;
+
+    QString name() const;
+    void setName(const QString &);
+
+    QString source() const;
+    void setSource(const QString &);
+
+    InjectionPoint injectionPoint() const;
+    void setInjectionPoint(InjectionPoint);
+
+    uint worldId() const;
+    void setWorldId(uint id);
+
+    bool runsOnSubFrames() const;
+    void setRunsOnSubFrames(bool on);
+
+    bool operator==(const UserScript &) const;
+
+private:
+    void initData();
+    UserScriptData &data() const;
+    friend class UserScriptControllerHost;
+
+    QScopedPointer<UserScriptData> scriptData;
+    QString m_name;
+};
+
+uint qHash(const UserScript &, uint seed = 0);
+
+#endif // USER_SCRIPT_H
diff --git a/src/core/user_script_controller_host.cpp b/src/core/user_script_controller_host.cpp
new file mode 100644
index 000000000..bf1248577
--- /dev/null
+++ b/src/core/user_script_controller_host.cpp
@@ -0,0 +1,208 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "user_script_controller_host.h"
+
+#include "common/qt_messages.h"
+#include "type_conversion.h"
+#include "web_contents_adapter.h"
+#include "web_contents_adapter_p.h"
+
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_process_host_observer.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+
+class UserScriptControllerHost::WebContentsObserverHelper : public content::WebContentsObserver {
+public:
+    WebContentsObserverHelper(UserScriptControllerHost *, content::WebContents *);
+    virtual void AboutToNavigateRenderView(content::RenderViewHost* renderViewHost) Q_DECL_OVERRIDE;
+
+    virtual void WebContentsDestroyed() Q_DECL_OVERRIDE;
+private:
+    UserScriptControllerHost *m_controllerHost;
+};
+
+UserScriptControllerHost::WebContentsObserverHelper::WebContentsObserverHelper(UserScriptControllerHost *controller, content::WebContents *contents)
+    : content::WebContentsObserver(contents)
+    , m_controllerHost(controller)
+{
+}
+
+void UserScriptControllerHost::WebContentsObserverHelper::AboutToNavigateRenderView(content::RenderViewHost *renderViewHost)
+{
+    content::WebContents *contents = web_contents();
+    Q_FOREACH (const UserScript &script, m_controllerHost->m_perContentsScripts.value(contents))
+        renderViewHost->Send(new RenderViewObserverHelper_AddScript(renderViewHost->GetRoutingID(), script.data()));
+}
+
+void UserScriptControllerHost::WebContentsObserverHelper::WebContentsDestroyed()
+{
+    m_controllerHost->webContentsDestroyed(web_contents());
+    delete this;
+}
+
+class UserScriptControllerHost::RenderProcessObserverHelper : public content::RenderProcessHostObserver {
+public:
+    RenderProcessObserverHelper(UserScriptControllerHost *);
+    virtual void RenderProcessHostDestroyed(content::RenderProcessHost *) Q_DECL_OVERRIDE;
+private:
+    UserScriptControllerHost *m_controllerHost;
+};
+
+UserScriptControllerHost::RenderProcessObserverHelper::RenderProcessObserverHelper(UserScriptControllerHost *controller)
+    : m_controllerHost(controller)
+{
+}
+
+void UserScriptControllerHost::RenderProcessObserverHelper::RenderProcessHostDestroyed(content::RenderProcessHost *renderer)
+{
+    Q_ASSERT(m_controllerHost);
+    m_controllerHost->m_observedProcesses.remove(renderer);
+}
+
+void UserScriptControllerHost::addUserScript(const UserScript &script, WebContentsAdapter *adapter)
+{
+    if (script.isNull())
+        return;
+    // Global scripts should be dispatched to all our render processes.
+    if (!adapter) {
+        m_profileWideScripts.insert(script);
+        Q_FOREACH (content::RenderProcessHost *renderer, m_observedProcesses)
+            renderer->Send(new UserScriptController_AddScript(script.data()));
+    } else {
+        content::WebContents *contents = adapter->webContents();
+        ContentsScriptsMap::iterator it = m_perContentsScripts.find(contents);
+        if (it == m_perContentsScripts.end()) {
+            // We need to keep track of RenderView/RenderViewHost changes for a given contents
+            // in order to make sure the scripts stay in sync
+            new WebContentsObserverHelper(this, contents);
+            it = m_perContentsScripts.insert(contents, (QSet<UserScript>() << script));
+        } else {
+            QSet<UserScript> currentScripts = it.value();
+            currentScripts.insert(script);
+            m_perContentsScripts.insert(contents, currentScripts);
+        }
+        contents->Send(new RenderViewObserverHelper_AddScript(contents->GetRoutingID(), script.data()));
+    }
+}
+
+bool UserScriptControllerHost::containsUserScript(const UserScript &script, WebContentsAdapter *adapter)
+{
+    if (script.isNull())
+        return false;
+    // Global scripts should be dispatched to all our render processes.
+    if (!adapter)
+        return m_profileWideScripts.contains(script);
+    return m_perContentsScripts.value(adapter->webContents()).contains(script);
+}
+
+bool UserScriptControllerHost::removeUserScript(const UserScript &script, WebContentsAdapter *adapter)
+{
+    if (script.isNull())
+        return false;
+    if (!adapter) {
+        QSet<UserScript>::iterator it = m_profileWideScripts.find(script);
+        if (it == m_profileWideScripts.end())
+            return false;
+        Q_FOREACH (content::RenderProcessHost *renderer, m_observedProcesses)
+            renderer->Send(new UserScriptController_RemoveScript((*it).data()));
+        m_profileWideScripts.erase(it);
+    } else {
+        content::WebContents *contents = adapter->webContents();
+        if (!m_perContentsScripts.contains(contents))
+            return false;
+        QSet<UserScript> &set(m_perContentsScripts[contents]);
+        QSet<UserScript>::iterator it = set.find(script);
+        if (it == set.end())
+            return false;
+        contents->Send(new RenderViewObserverHelper_RemoveScript(contents->GetRoutingID(), (*it).data()));
+        set.erase(it);
+    }
+    return true;
+}
+
+void UserScriptControllerHost::clearAllScripts(WebContentsAdapter *adapter)
+{
+    if (!adapter) {
+        m_profileWideScripts.clear();
+        Q_FOREACH (content::RenderProcessHost *renderer, m_observedProcesses)
+            renderer->Send(new UserScriptController_ClearScripts);
+    } else {
+        content::WebContents *contents = adapter->webContents();
+        m_perContentsScripts.remove(contents);
+        contents->Send(new RenderViewObserverHelper_ClearScripts(contents->GetRoutingID()));
+    }
+}
+
+const QSet<UserScript> UserScriptControllerHost::registeredScripts(WebContentsAdapter *adapter) const
+{
+    if (!adapter)
+        return m_profileWideScripts;
+    return m_perContentsScripts.value(adapter->webContents());
+}
+
+void UserScriptControllerHost::reserve(WebContentsAdapter *adapter, int count)
+{
+    if (!adapter)
+        m_profileWideScripts.reserve(count);
+    else
+        m_perContentsScripts[adapter->webContents()].reserve(count);
+}
+
+void UserScriptControllerHost::renderProcessHostCreated(content::RenderProcessHost *renderer)
+{
+    if (m_renderProcessObserver.isNull())
+        m_renderProcessObserver.reset(new RenderProcessObserverHelper(this));
+    renderer->AddObserver(m_renderProcessObserver.data());
+    m_observedProcesses.insert(renderer);
+    Q_FOREACH (const UserScript &script, m_profileWideScripts)
+        renderer->Send(new UserScriptController_AddScript(script.data()));
+}
+
+void UserScriptControllerHost::webContentsDestroyed(content::WebContents *contents)
+{
+    m_perContentsScripts.remove(contents);
+}
+
+UserScriptControllerHost::UserScriptControllerHost()
+{
+}
+
+UserScriptControllerHost::~UserScriptControllerHost()
+{
+}
diff --git a/src/core/user_script_controller_host.h b/src/core/user_script_controller_host.h
new file mode 100644
index 000000000..790d40912
--- /dev/null
+++ b/src/core/user_script_controller_host.h
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef USER_SCRIPT_CONTROLLER_HOST_H
+#define USER_SCRIPT_CONTROLLER_HOST_H
+
+#include "qtwebenginecoreglobal.h"
+
+#include <QtCore/QSet>
+#include <QtCore/QScopedPointer>
+#include "user_script.h"
+
+class WebContentsAdapterPrivate;
+namespace content {
+class RenderProcessHost;
+class WebContents;
+}
+class WebContentsAdapter;
+
+class QWEBENGINE_EXPORT UserScriptControllerHost {
+
+public:
+    UserScriptControllerHost();
+    ~UserScriptControllerHost();
+
+    void addUserScript(const UserScript &script, WebContentsAdapter *adapter);
+    bool containsUserScript(const UserScript &script, WebContentsAdapter *adapter);
+    bool removeUserScript(const UserScript &script, WebContentsAdapter *adapter);
+    void clearAllScripts(WebContentsAdapter *adapter);
+    void reserve(WebContentsAdapter *adapter, int count);
+    const QSet<UserScript> registeredScripts(WebContentsAdapter *adapter) const;
+
+    void renderProcessHostCreated(content::RenderProcessHost *renderer);
+
+private:
+    Q_DISABLE_COPY(UserScriptControllerHost)
+    class WebContentsObserverHelper;
+    class RenderProcessObserverHelper;
+
+    void webContentsDestroyed(content::WebContents *);
+
+    QSet<UserScript> m_profileWideScripts;
+    typedef QHash<content::WebContents *, QSet<UserScript>> ContentsScriptsMap;
+    ContentsScriptsMap m_perContentsScripts;
+    QSet<content::RenderProcessHost *> m_observedProcesses;
+    QScopedPointer<RenderProcessObserverHelper> m_renderProcessObserver;
+};
+
+#endif // USER_SCRIPT_CONTROLLER_HOST_H
diff --git a/src/core/web_contents_adapter_p.h b/src/core/web_contents_adapter_p.h
index e0b13013b..6ddff47a5 100644
--- a/src/core/web_contents_adapter_p.h
+++ b/src/core/web_contents_adapter_p.h
@@ -46,6 +46,7 @@
 
 class BrowserContextAdapter;
 class QtRenderViewObserverHost;
+class UserScriptControllerHost;
 class WebChannelIPCTransportHost;
 class WebContentsAdapterClient;
 class WebContentsDelegateQt;