Use WindowActivated message instead of VisibilityChanged message to determine that Ash is the activ…

ui/aura/remote_root_window_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_ROOT_WINDOW_HOST_WIN_H_
 #define UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 136 matching lines @@
                  uint32 scan_code,
                  uint32 flags);
   void OnKeyUp(uint32 vkey,
                uint32 repeat_count,
                uint32 scan_code,
                uint32 flags);
   void OnChar(uint32 key_code,
               uint32 repeat_count,
               uint32 scan_code,
               uint32 flags);
-  void OnVisibilityChanged(bool visible);
+  void OnWindowActivated();
   void OnTouchDown(int32 x, int32 y, uint64 timestamp, uint32 pointer_id);
   void OnTouchUp(int32 x, int32 y, uint64 timestamp, uint32 pointer_id);
   void OnTouchMoved(int32 x, int32 y, uint64 timestamp, uint32 pointer_id);
   void OnFileSaveAsDone(bool success,
                         const base::FilePath& filename,
                         int filter_index);
   void OnFileOpenDone(bool success, const base::FilePath& filename);
   void OnMultiFileOpenDone(bool success,
                            const std::vector<base::FilePath>& files);
   void OnSelectFolderDone(bool success, const base::FilePath& folder);
@@ skipping 56 matching lines @@
 
   // Tracking last click event for synthetically generated mouse events.
   scoped_ptr<ui::MouseEvent> last_mouse_click_event_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteRootWindowHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_