Send a message through the ozone channel to recreate buffers

ui/platform_window/platform_window_delegate.h

 // Copyright 2014 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_PLATFORM_WINDOW_PLATFORM_WINDOW_DELEGATE_H_
 #define UI_PLATFORM_WINDOW_PLATFORM_WINDOW_DELEGATE_H_
 
 #include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
@@ skipping 12 matching lines @@
   PLATFORM_WINDOW_STATE_FULLSCREEN,
 };
 
 class PlatformWindowDelegate {
  public:
   virtual ~PlatformWindowDelegate() {}
 
   // Note that |new_bounds| is in physical screen coordinates.
   virtual void OnBoundsChanged(const gfx::Rect& new_bounds) = 0;
 
+  virtual void OnChangedSurface() = 0;
+
   // Note that |damaged_region| is in the platform-window's coordinates, in
   // physical pixels.
   virtual void OnDamageRect(const gfx::Rect& damaged_region) = 0;
 
   virtual void DispatchEvent(Event* event) = 0;
 
   virtual void OnCloseRequest() = 0;
   virtual void OnClosed() = 0;
 
   virtual void OnWindowStateChanged(PlatformWindowState new_state) = 0;
 
   virtual void OnLostCapture() = 0;
 
   virtual void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) = 0;
 
   virtual void OnActivationChanged(bool active) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_PLATFORM_WINDOW_PLATFORM_WINDOW_DELEGATE_H_