Fix a long standing painting problem seen in the tabstrip on Windows Desktop Chrome.

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index 4109599dc601d6147aa4aef692b4c881cd413caa..6e2898b706cd14a00cd9c10e7dbcc4deb7096ea3 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -203,6 +203,8 @@ class VIEWS_EXPORT HWNDMessageHandler :
     use_system_default_icon_ = use_system_default_icon;
   }
 
+  void SetFullscreen(bool fullscreen);
+
  private:
   typedef std::set<DWORD> TouchIDs;
 
@@ -483,6 +485,9 @@ class VIEWS_EXPORT HWNDMessageHandler :
                                  int message_time,
                                  LPARAM l_param);
 
+  // Provides functionality to transition a frame to and from DWM.
+  void PerformDwmTransition();
+
   HWNDMessageHandlerDelegate* delegate_;
 
   scoped_ptr<FullscreenHandler> fullscreen_handler_;
@@ -612,6 +617,10 @@ class VIEWS_EXPORT HWNDMessageHandler :
   // HandleMouseEventInternal function as to why this is needed.
   long last_mouse_hwheel_time_;
 
+  // Set to true if DWM transition is desired for this window. Defaults to
+  // false.
+  bool dwm_transition_desired_;
+
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };