Refactor how surfaces are acquired for GPU compositing.

chrome/browser/renderer_host/render_widget_host_view.h

 // Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
@@ skipping 243 matching lines @@
   virtual void GpuRenderingStateDidChange() = 0;
 #endif
 
 #if defined(TOOLKIT_USES_GTK)
   virtual void CreatePluginContainer(gfx::PluginWindowHandle id) = 0;
   virtual void DestroyPluginContainer(gfx::PluginWindowHandle id) = 0;
   virtual void AcceleratedCompositingActivated(bool activated) = 0;
 #endif
 
 #if defined(OS_WIN)
-  virtual gfx::PluginWindowHandle GetCompositorHostWindow() = 0;
   virtual void WillWmDestroy() = 0;
   virtual void ShowCompositorHostWindow(bool show) = 0;
 #endif
 
+  virtual gfx::PluginWindowHandle AcquireCompositingSurface() = 0;
+  virtual void ReleaseCompositingSurface(gfx::PluginWindowHandle surface) = 0;
+
   // Toggles visual muting of the render view area. This is on when a
   // constrained window is showing, for example. |color| is the shade of
   // the overlay that covers the render view. If |animate| is true, the overlay
   // gradually fades in; otherwise it takes effect immediately. To remove the
   // fade effect, pass a NULL value for |color|. In this case, |animate| is
   // ignored.
   virtual void SetVisuallyDeemphasized(const SkColor* color, bool animate) = 0;
 
   void set_popup_type(WebKit::WebPopupType popup_type) {
     popup_type_ = popup_type;
@@ skipping 36 matching lines @@
 
   // The current reserved area in view coordinates where contents should not be
   // rendered to draw the resize corner, sidebar mini tabs etc.
   gfx::Rect reserved_rect_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_