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

ui/aura/window_tree_host.h

Index: ui/aura/window_tree_host.h
diff --git a/ui/aura/window_tree_host.h b/ui/aura/window_tree_host.h
index ca4a164da313a6c6e0c50ee34406c7928aa671ba..55d119e9953818760613dcae9a0b47a80de6b9c1 100644
--- a/ui/aura/window_tree_host.h
+++ b/ui/aura/window_tree_host.h
@@ -28,7 +28,6 @@ class ViewProp;
 }
 
 namespace aura {
-class RootWindowTransformer;
 class WindowEventDispatcher;
 class WindowTreeHostObserver;
 
@@ -66,16 +65,14 @@ class AURA_EXPORT WindowTreeHost {
 
   ui::Compositor* compositor() { return compositor_.get(); }
 
-  void SetRootWindowTransformer(scoped_ptr<RootWindowTransformer> transformer);
-  gfx::Transform GetRootTransform() const;
-
-  void SetTransform(const gfx::Transform& transform);
-
-  gfx::Transform GetInverseRootTransform() const;
+  // Gets/Sets the root window's transform.
+  virtual gfx::Transform GetRootTransform() const;
+  virtual void SetRootTransform(const gfx::Transform& transform);
+  virtual gfx::Transform GetInverseRootTransform() const;
 
   // Updates the root window's size using |host_size|, current
   // transform and insets.
-  void UpdateRootWindowSize(const gfx::Size& host_size);
+  virtual void UpdateRootWindowSize(const gfx::Size& host_size);
 
   // Returns the actual size of the screen.
   // (gfx::Screen only reports on the virtual desktop exposed by Aura.)
@@ -123,18 +120,10 @@ class AURA_EXPORT WindowTreeHost {
   // Hides the WindowTreeHost.
   virtual void Hide() = 0;
 
-  // Toggles the host's full screen state.
-  virtual void ToggleFullScreen() = 0;
-
   // Gets/Sets the size of the WindowTreeHost.
   virtual gfx::Rect GetBounds() const = 0;
   virtual void SetBounds(const gfx::Rect& bounds) = 0;
 
-  // Sets/Gets the insets that specifies the effective root window area
-  // in the host window.
-  virtual gfx::Insets GetInsets() const = 0;
-  virtual void SetInsets(const gfx::Insets& insets) = 0;
-
   // Sets the OS capture to the root window.
   virtual void SetCapture() = 0;
 
@@ -149,14 +138,6 @@ class AURA_EXPORT WindowTreeHost {
   // This method is expensive, instead use gfx::Screen::GetCursorScreenPoint().
   virtual bool QueryMouseLocation(gfx::Point* location_return) = 0;
 
-  // Clips the cursor to the bounds of the root window until UnConfineCursor().
-  // We would like to be able to confine the cursor to that window. However,
-  // currently, we do not have such functionality in X. So we just confine
-  // to the root window. This is ok because this option is currently only
-  // being used in fullscreen mode, so root_window bounds = window bounds.
-  virtual bool ConfineCursorToRootWindow() = 0;
-  virtual void UnConfineCursor() = 0;
-
   // Posts |native_event| to the platform's event queue.
   virtual void PostNativeEvent(const base::NativeEvent& native_event) = 0;
 
@@ -208,8 +189,6 @@ class AURA_EXPORT WindowTreeHost {
 
   scoped_ptr<ui::Compositor> compositor_;
 
-  scoped_ptr<RootWindowTransformer> transformer_;
-
   // Last cursor set.  Used for testing.
   gfx::NativeCursor last_cursor_;