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

content/public/common/content_client.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_PUBLIC_COMMON_CONTENT_CLIENT_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_CLIENT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 99 matching lines @@
 
   // Returns the user agent.
   virtual std::string GetUserAgent() const = 0;
 
   // Returns a string resource given its id.
   virtual string16 GetLocalizedString(int message_id) const = 0;
 
   // Return the contents of a resource in a StringPiece given the resource id.
   virtual base::StringPiece GetDataResource(int resource_id) const = 0;
 
+  // Return the contents of an image resource in a StringPiece given the
+  // resource id.
+  virtual base::StringPiece GetImageResource(int resource_id,
+                                             float scale_factor) const = 0;
+
 #if defined(OS_WIN)
   // Allows the embedder to sandbox a plugin, and apply a custom policy.
   virtual bool SandboxPlugin(CommandLine* command_line,
                              sandbox::TargetPolicy* policy) = 0;
 #endif
 
 #if defined(OS_MACOSX)
   // Allows the embedder to define a new |sandbox_type| by mapping it to the
   // resource ID corresponding to the sandbox profile to use. The legal values
   // for |sandbox_type| are defined by the embedder and should start with
@@ skipping 13 matching lines @@
   ContentPluginClient* plugin_;
   // The embedder API for participating in renderer logic.
   ContentRendererClient* renderer_;
   // The embedder API for participating in utility logic.
   ContentUtilityClient* utility_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_CLIENT_H_