Adding GetEventSource() method to the WindowTreeHost class.

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 204 matching lines @@
   void OnImeCandidatePopupChanged(bool visible);
   void OnImeCompositionChanged(
       const base::string16& text,
       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 ui::EventSource* GetEventSource() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual bool QueryMouseLocation(gfx::Point* location_return) OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
@@ skipping 64 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_