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

ui/views/win/hwnd_message_handler.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_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 
 #include <set>
@@ skipping 185 matching lines @@
                       const gfx::ImageSkia& app_icon);
 
   void set_remove_standard_frame(bool remove_standard_frame) {
     remove_standard_frame_ = remove_standard_frame;
   }
 
   void set_use_system_default_icon(bool use_system_default_icon) {
     use_system_default_icon_ = use_system_default_icon;
   }
 
+  void SetFullscreen(bool fullscreen);
+
  private:
   typedef std::set<DWORD> TouchIDs;
 
   // Overridden from internal::InputMethodDelegate:
   virtual void DispatchKeyEventPostIME(const ui::KeyEvent& key) OVERRIDE;
 
   // Overridden from WindowImpl:
   virtual HICON GetDefaultWindowIcon() const OVERRIDE;
   virtual LRESULT OnWndProc(UINT message,
                             WPARAM w_param,
@@ skipping 260 matching lines @@
 
   // Returns true if the mouse message passed in is an OS synthesized mouse
   // message.
   // |message| identifies the mouse message.
   // |message_time| is the time when the message occurred.
   // |l_param| indicates the location of the mouse message.
   bool IsSynthesizedMouseMessage(unsigned int message,
                                  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_;
 
   // Set to true in Close() and false is CloseNow().
   bool waiting_for_close_now_;
 
   bool remove_standard_frame_;
 
   bool use_system_default_icon_;
@@ skipping 109 matching lines @@
   // Time the last touch message was received. Used to flag mouse messages
   // synthesized by Windows for touch which are not flagged by the OS as
   // synthesized mouse messages. For more information please refer to
   // the IsMouseEventFromTouch function.
   static long last_touch_message_time_;
 
   // Time the last WM_MOUSEHWHEEL message is received. Please refer to the
   // 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);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_