Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

ui/aura/remote_window_tree_host_win.h

 // 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_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_
 #define UI_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 89 matching lines @@
 
 // WindowTreeHost implementaton that receives events from a different
 // process. In the case of Windows this is the Windows 8 (aka Metro)
 // frontend process, which forwards input events to this class.
 class AURA_EXPORT RemoteWindowTreeHostWin
     : public WindowTreeHost,
       public ui::EventSource,
       public ui::internal::RemoteInputMethodDelegateWin {
  public:
   // Returns the only RemoteWindowTreeHostWin, if this is the first time
-  // this function is called, it will call Create() wiht empty bounds.
+  // this function is called and the instance have never set by SetInstance,
+  // it will call Create() wiht empty bounds.
   static RemoteWindowTreeHostWin* Instance();
-  static RemoteWindowTreeHostWin* Create(const gfx::Rect& bounds);
+
+  // Manually sets the instance to be used as a return value of |Instance()|
+  // method above. This should not be called if the instance has already
+  // been set or created, and doing so will result in CHECK failure.
+  static void SetInstance(RemoteWindowTreeHostWin* instance);
 
   // Returns true if there is a RemoteWindowTreeHostWin and it has a valid
   // HWND. A return value of false typically indicates we're not in metro mode.
   static bool IsValid();
 
   // Sets the handle to the remote window. The |remote_window| is the actual
   // window owned by the viewer process. Call this before Connected() for some
   // customers like input method initialization which needs the handle.
   void SetRemoteWindowHandle(HWND remote_window);
 
@@ skipping 41 matching lines @@
 
   void HandleWindowSizeChanged(uint32 width, uint32 height);
 
   // Returns the active ASH root window.
   Window* GetAshWindow();
 
   // Returns true if the remote window is the foreground window according to the
   // OS.
   bool IsForegroundWindow();
 
- private:
+ protected:
   explicit RemoteWindowTreeHostWin(const gfx::Rect& bounds);
   virtual ~RemoteWindowTreeHostWin();
 
+ private:
   // IPC message handing methods:
   void OnMouseMoved(int32 x, int32 y, int32 flags);
   void OnMouseButton(const MetroViewerHostMsg_MouseButtonParams& params);
   void OnKeyDown(uint32 vkey,
                  uint32 repeat_count,
                  uint32 scan_code,
                  uint32 flags);
   void OnKeyUp(uint32 vkey,
                uint32 repeat_count,
                uint32 scan_code,
@@ skipping 24 matching lines @@
       int32 selection_start,
       int32 selection_end,
       const std::vector<metro_viewer::UnderlineInfo>& underlines);
   void OnImeTextCommitted(const base::string16& text);
   void OnImeInputSourceChanged(uint16 language_id, bool is_ime);
 
   // WindowTreeHost overrides:
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
-  virtual void ToggleFullScreen() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
-  virtual gfx::Insets GetInsets() const OVERRIDE;
-  virtual void SetInsets(const gfx::Insets& insets) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual bool QueryMouseLocation(gfx::Point* location_return) OVERRIDE;
-  virtual bool ConfineCursorToRootWindow() OVERRIDE;
-  virtual void UnConfineCursor() OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void SetCursorNative(gfx::NativeCursor cursor) OVERRIDE;
   virtual void MoveCursorToNative(const gfx::Point& location) OVERRIDE;
   virtual void OnCursorVisibilityChangedNative(bool show) OVERRIDE;
 
   // ui::EventSource:
   virtual ui::EventProcessor* GetEventProcessor() OVERRIDE;
 
   // ui::internal::RemoteInputMethodDelegateWin overrides:
@@ skipping 55 matching lines @@
 
   // Current size of this root window.
   gfx::Size window_size_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteWindowTreeHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_