Update window region after widget resizes not changing HWND size

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 112 matching lines @@
 
   gfx::Rect GetWindowBoundsInScreen() const;
   gfx::Rect GetClientAreaBoundsInScreen() const;
   gfx::Rect GetRestoredBounds() const;
   // This accounts for the case where the widget size is the client size.
   gfx::Rect GetClientAreaBounds() const;
 
   void GetWindowPlacement(gfx::Rect* bounds,
                           ui::WindowShowState* show_state) const;
 
-  void SetBounds(const gfx::Rect& bounds_in_pixels);
+  // Sets the bounds of the HWND to |bounds_in_pixels|. If the HWND size is not
+  // changed, |force_size_changed| determines if we should pretend it is.
+  void SetBounds(const gfx::Rect& bounds_in_pixels, bool force_size_changed);
+
   void SetSize(const gfx::Size& size);
   void CenterWindow(const gfx::Size& size);
 
   void SetRegion(HRGN rgn);
 
   void StackAbove(HWND other_hwnd);
   void StackAtTop();
 
   void Show();
   void ShowWindowWithState(ui::WindowShowState show_state);
@@ skipping 457 matching lines @@
   // 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_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_