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

webkit/glue/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 WEBKIT_PLATFORM_SUPPORT_IMPL_H_
 #define WEBKIT_PLATFORM_SUPPORT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/platform_file.h"
 #include "base/threading/thread_local_storage.h"
@@ skipping 103 matching lines @@
   // need to be specialized by the embedder.
 
   // Gets a localized string given a message id.  Returns an empty string if the
   // message id is not found.
   virtual string16 GetLocalizedString(int message_id) = 0;
 
   // Returns the raw data for a resource.  This resource must have been
   // specified as BINDATA in the relevant .rc file.
   virtual base::StringPiece GetDataResource(int resource_id) = 0;
 
+  // Returns the raw data for an image resource with a scale factor as close as
+  // is available to |scale_factor|.  This resource must have been specified as
+  // BINDATA in the relevant .rc file.
+  virtual base::StringPiece GetImageResource(int resource_id,
+                                             float scale_factor) = 0;
+
   // Returns the list of plugins.
   virtual void GetPlugins(bool refresh,
                           std::vector<webkit::WebPluginInfo>* plugins) = 0;
   // Creates a ResourceLoaderBridge.
   virtual ResourceLoaderBridge* CreateResourceLoader(
       const ResourceLoaderBridge::RequestInfo& request_info) = 0;
   // Creates a WebSocketStreamHandleBridge.
   virtual WebSocketStreamHandleBridge* CreateWebSocketBridge(
       WebKit::WebSocketStreamHandle* handle,
       WebSocketStreamHandleDelegate* delegate) = 0;
@@ skipping 19 matching lines @@
   void (*shared_timer_func_)();
   double shared_timer_fire_time_;
   int shared_timer_suspended_;  // counter
   WebThemeEngineImpl theme_engine_;
   base::ThreadLocalStorage::Slot current_thread_slot_;
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_PLATFORM_SUPPORT_IMPL_H_