Provide shared context to Platform API in renderer.

content/browser/in_process_webkit/browser_webkitplatformsupport_impl.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_BROWSER_IN_PROCESS_WEBKIT_BROWSER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_BROWSER_IN_PROCESS_WEBKIT_BROWSER_WEBKITPLATFORMSUPPORT_IMPL_H_
 
 #include "content/common/webkitplatformsupport_impl.h"
 #include "webkit/glue/webfileutilities_impl.h"
 
@@ skipping 22 matching lines @@
       const WebKit::WebURL& first_party_for_cookies);
   virtual void prefetchHostName(const WebKit::WebString&);
   virtual WebKit::WebString defaultLocale();
   virtual WebKit::WebThemeEngine* themeEngine();
   virtual WebKit::WebURLLoader* createURLLoader();
   virtual WebKit::WebSocketStreamHandle* createSocketStreamHandle();
   virtual void getPluginList(bool refresh, WebKit::WebPluginListBuilder*);
   virtual WebKit::WebData loadResource(const char* name);
   virtual int databaseDeleteFile(const WebKit::WebString& vfs_file_name,
                                  bool sync_dir);
-
- protected:
-  virtual GpuChannelHostFactory* GetGpuChannelHostFactory() OVERRIDE;
+  virtual WebKit::WebGraphicsContext3D* createOffscreenGraphicsContext3D(
+      const WebKit::WebGraphicsContext3D::Attributes& attributes);
+  virtual WebKit::WebGraphicsContext3D* sharedOffscreenGraphicsContext3D();
 
  private:
   webkit_glue::WebFileUtilitiesImpl file_utilities_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_BROWSER_WEBKITPLATFORMSUPPORT_IMPL_H_