Add scale factor and 2x resources from webkit and plumb through to ContentClient.

content/common/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_COMMON_CONTENT_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_COMMON_CONTENT_WEBKITPLATFORMSUPPORT_IMPL_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
 #include "webkit/glue/webkitplatformsupport_impl.h"
 
 class GpuChannelHostFactory;
 
 namespace content {
 
 // This is a specialization of WebKitPlatformSupportImpl that implements the
 // embedder functions in terms of ContentClient.
 class CONTENT_EXPORT WebKitPlatformSupportImpl
     : NON_EXPORTED_BASE(public webkit_glue::WebKitPlatformSupportImpl) {
  public:
   WebKitPlatformSupportImpl();
   virtual ~WebKitPlatformSupportImpl();
 
   virtual string16 GetLocalizedString(int message_id) OVERRIDE;
   virtual base::StringPiece GetDataResource(int resource_id) OVERRIDE;
+  virtual base::StringPiece GetImageResource(int resource_id,
+                                             float scale_factor) OVERRIDE;
   virtual void GetPlugins(bool refresh,
                           std::vector<webkit::WebPluginInfo>* plugins) OVERRIDE;
   virtual webkit_glue::ResourceLoaderBridge* CreateResourceLoader(
       const webkit_glue::ResourceLoaderBridge::RequestInfo& request_info)
       OVERRIDE;
   virtual webkit_glue::WebSocketStreamHandleBridge* CreateWebSocketBridge(
       WebKit::WebSocketStreamHandle* handle,
       webkit_glue::WebSocketStreamHandleDelegate* delegate) OVERRIDE;
   virtual WebKit::WebGraphicsContext3D* createOffscreenGraphicsContext3D(
       const WebKit::WebGraphicsContext3D::Attributes& attributes);
 
  protected:
   virtual GpuChannelHostFactory* GetGpuChannelHostFactory();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_CONTENT_WEBKITPLATFORMSUPPORT_IMPL_H_