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

chrome/common/chrome_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 CHROME_COMMON_CHROME_CONTENT_CLIENT_H_
 #define CHROME_COMMON_CHROME_CONTENT_CLIENT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 16 matching lines @@
   virtual void AddNPAPIPlugins(
       webkit::npapi::PluginList* plugin_list) OVERRIDE;
   virtual void AddAdditionalSchemes(
       std::vector<std::string>* standard_schemes,
       std::vector<std::string>* saveable_shemes) OVERRIDE;
   virtual bool HasWebUIScheme(const GURL& url) const OVERRIDE;
   virtual bool CanHandleWhileSwappedOut(const IPC::Message& msg) OVERRIDE;
   virtual std::string GetUserAgent() const OVERRIDE;
   virtual string16 GetLocalizedString(int message_id) const OVERRIDE;
   virtual base::StringPiece GetDataResource(int resource_id) const OVERRIDE;
+  virtual base::StringPiece GetImageResource(int resource_id,
+                                             float scale_factor) const OVERRIDE;
 
 #if defined(OS_WIN)
   virtual bool SandboxPlugin(CommandLine* command_line,
                              sandbox::TargetPolicy* policy) OVERRIDE;
 #endif
 
 #if defined(OS_MACOSX)
   virtual bool GetSandboxProfileForSandboxType(
       int sandbox_type,
       int* sandbox_profile_resource_id) const OVERRIDE;
 #endif
 
   // Gets information about the bundled Pepper Flash for field trial.
   // |override_npapi_flash| indicates whether it should take precedence over
   // the internal NPAPI Flash.
   // Returns false if bundled Pepper Flash is not available. In that case,
   // |plugin| and |override_npapi_flash| are not touched.
   //
   // TODO(yzshen): We need this method because currently we are having a field
   // trial with bundled Pepper Flash, and need extra information about how to
   // order bundled Pepper Flash and internal NPAPI Flash. Once the field trial
   // is over, we should merge this into AddPepperPlugins().
   bool GetBundledFieldTrialPepperFlash(content::PepperPluginInfo* plugin,
                                        bool* override_npapi_flash);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_CONTENT_CLIENT_H_