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

webkit/support/test_webkit_platform_support.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 WEBKIT_SUPPORT_TEST_WEBKIT_PLATFORM_SUPPORT_H_
 #define WEBKIT_SUPPORT_TEST_WEBKIT_PLATFORM_SUPPORT_H_
 
 #include "base/compiler_specific.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGamepads.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGraphicsContext3D.h"
@@ skipping 94 matching lines @@
   virtual size_t audioHardwareBufferSize() OVERRIDE;
   virtual WebKit::WebAudioDevice* createAudioDevice(size_t bufferSize,
       unsigned numberOfChannels, double sampleRate,
       WebKit::WebAudioDevice::RenderCallback*) OVERRIDE;
 
   virtual void sampleGamepads(WebKit::WebGamepads& data);
   void setGamepadData(const WebKit::WebGamepads& data);
 
   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;
 
  private:
@@ skipping 12 matching lines @@
   bool unit_test_mode_;
   WebKit::WebGamepads gamepad_data_;
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
   WebKit::WebThemeEngine* active_theme_engine_;
 #endif
   DISALLOW_COPY_AND_ASSIGN(TestWebKitPlatformSupport);
 };
 
 #endif  // WEBKIT_SUPPORT_TEST_WEBKIT_PLATFORM_SUPPORT_H_