Get windowless plugins working when accelerated compositing is turned on.

content/renderer/webplugin_delegate_proxy.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 CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_
 #define CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 189 matching lines @@
 #endif
 
   void OnURLRedirectResponse(bool allow, int resource_id);
 
   // Helper function that sends the UpdateGeometry message.
   void SendUpdateGeometry(bool bitmaps_changed);
 
   // Draw a graphic indicating a crashed plugin.
   void PaintSadPlugin(WebKit::WebCanvas* canvas, const gfx::Rect& rect);
 
-  // Returns true if the given rectangle is different in the native drawing
-  // context and the current background bitmap.
-  bool BackgroundChanged(gfx::NativeDrawingContext context,
-                         const gfx::Rect& rect);
+  // Returns true if the given rectangle is different in the canvas and the
+  // current background bitmap.
+  bool BackgroundChanged(SkCanvas* canvas, const gfx::Rect& rect);
 
   // Copies the given rectangle from the back-buffer transport_stores_ bitmap to
   // the front-buffer transport_stores_ bitmap.
   void CopyFromBackBufferToFrontBuffer(const gfx::Rect& rect);
 
   // Updates the front-buffer with the given rectangle from the back-buffer,
   // either by copying the rectangle or flipping the buffers.
   void UpdateFrontBuffer(const gfx::Rect& rect, bool allow_buffer_flipping);
 
   // Clears the shared memory section and canvases used for windowless plugins.
@@ skipping 105 matching lines @@
 
   // The url of the main frame hosting the plugin.
   GURL page_url_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_