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diff --git a/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h b/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h
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index 00000000000..9ccb67225a1
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+++ b/chromium/ui/views/widget/desktop_aura/desktop_window_tree_host.h
@@ -0,0 +1,163 @@
+// 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.
+
+#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/base/ui_base_types.h"
+#include "ui/views/views_export.h"
+#include "ui/views/widget/widget.h"
+
+namespace aura {
+class WindowTreeHost;
+class Window;
+
+namespace client {
+class DragDropClient;
+}
+}
+
+namespace gfx {
+class ImageSkia;
+class Rect;
+}
+
+namespace ui {
+class NativeTheme;
+}
+
+namespace views {
+namespace corewm {
+class Tooltip;
+}
+
+namespace internal {
+class NativeWidgetDelegate;
+}
+
+class DesktopNativeCursorManager;
+class DesktopNativeWidgetAura;
+
+class VIEWS_EXPORT DesktopWindowTreeHost {
+ public:
+  virtual ~DesktopWindowTreeHost() {}
+
+  static DesktopWindowTreeHost* Create(
+      internal::NativeWidgetDelegate* native_widget_delegate,
+      DesktopNativeWidgetAura* desktop_native_widget_aura);
+
+  // Return the NativeTheme to use for |window|. WARNING: |window| may be NULL.
+  static ui::NativeTheme* GetNativeTheme(aura::Window* window);
+
+  // Sets up resources needed before the WindowEventDispatcher has been created.
+  virtual void Init(aura::Window* content_window,
+                    const Widget::InitParams& params) = 0;
+
+  // Invoked once the DesktopNativeWidgetAura has been created.
+  virtual void OnNativeWidgetCreated(const Widget::InitParams& params) = 0;
+
+  // Creates and returns the Tooltip implementation to use. Return value is
+  // owned by DesktopNativeWidgetAura and lives as long as
+  // DesktopWindowTreeHost.
+  virtual scoped_ptr<corewm::Tooltip> CreateTooltip() = 0;
+
+  // Creates and returns the DragDropClient implementation to use. Return value
+  // is owned by DesktopNativeWidgetAura and lives as long as
+  // DesktopWindowTreeHost.
+  virtual scoped_ptr<aura::client::DragDropClient> CreateDragDropClient(
+      DesktopNativeCursorManager* cursor_manager) = 0;
+
+  virtual void Close() = 0;
+  virtual void CloseNow() = 0;
+
+  virtual aura::WindowTreeHost* AsWindowTreeHost() = 0;
+
+  virtual void ShowWindowWithState(ui::WindowShowState show_state) = 0;
+  virtual void ShowMaximizedWithBounds(const gfx::Rect& restored_bounds) = 0;
+
+  virtual bool IsVisible() const = 0;
+
+  virtual void SetSize(const gfx::Size& size) = 0;
+  virtual void StackAtTop() = 0;
+  virtual void CenterWindow(const gfx::Size& size) = 0;
+  virtual void GetWindowPlacement(gfx::Rect* bounds,
+                                  ui::WindowShowState* show_state) const = 0;
+  virtual gfx::Rect GetWindowBoundsInScreen() const = 0;
+  virtual gfx::Rect GetClientAreaBoundsInScreen() const = 0;
+  virtual gfx::Rect GetRestoredBounds() const = 0;
+
+  virtual gfx::Rect GetWorkAreaBoundsInScreen() const = 0;
+
+  // Sets the shape of the root window. If |native_region| is NULL then the
+  // window reverts to rectangular. Takes ownership of |native_region|.
+  virtual void SetShape(gfx::NativeRegion native_region) = 0;
+
+  virtual void Activate() = 0;
+  virtual void Deactivate() = 0;
+  virtual bool IsActive() const = 0;
+  virtual void Maximize() = 0;
+  virtual void Minimize() = 0;
+  virtual void Restore() = 0;
+  virtual bool IsMaximized() const = 0;
+  virtual bool IsMinimized() const = 0;
+
+  virtual bool HasCapture() const = 0;
+
+  virtual void SetAlwaysOnTop(bool always_on_top) = 0;
+  virtual bool IsAlwaysOnTop() const = 0;
+
+  virtual void SetVisibleOnAllWorkspaces(bool always_visible) = 0;
+
+  // Returns true if the title changed.
+  virtual bool SetWindowTitle(const base::string16& title) = 0;
+
+  virtual void ClearNativeFocus() = 0;
+
+  virtual Widget::MoveLoopResult RunMoveLoop(
+      const gfx::Vector2d& drag_offset,
+      Widget::MoveLoopSource source,
+      Widget::MoveLoopEscapeBehavior escape_behavior) = 0;
+  virtual void EndMoveLoop() = 0;
+
+  virtual void SetVisibilityChangedAnimationsEnabled(bool value) = 0;
+
+  // Determines whether the window should use native title bar and borders.
+  virtual bool ShouldUseNativeFrame() const = 0;
+  // Determines whether the window contents should be rendered transparently
+  // (for example, so that they can overhang onto the window title bar).
+  virtual bool ShouldWindowContentsBeTransparent() const = 0;
+  virtual void FrameTypeChanged() = 0;
+
+  virtual void SetFullscreen(bool fullscreen) = 0;
+  virtual bool IsFullscreen() const = 0;
+
+  virtual void SetOpacity(unsigned char opacity) = 0;
+
+  virtual void SetWindowIcons(const gfx::ImageSkia& window_icon,
+                              const gfx::ImageSkia& app_icon) = 0;
+
+  virtual void InitModalType(ui::ModalType modal_type) = 0;
+
+  virtual void FlashFrame(bool flash_frame) = 0;
+
+  virtual void OnRootViewLayout() const = 0;
+
+  // Called when the DesktopNativeWidgetAura's aura::Window is focused and
+  // blurred.
+  virtual void OnNativeWidgetFocus() = 0;
+  virtual void OnNativeWidgetBlur() = 0;
+
+  // Returns true if the Widget was closed but is still showing because of
+  // animations.
+  virtual bool IsAnimatingClosed() const = 0;
+
+  // Returns true if the Widget supports translucency.
+  virtual bool IsTranslucentWindowOpacitySupported() const = 0;
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_