Add scale factor tag to data packs

ui/base/resource/resource_bundle.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 UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 69 matching lines @@
   static bool HasSharedInstance();
 
   // Return the global resource loader instance.
   static ResourceBundle& GetSharedInstance();
 
   // Check if the .pak for the given locale exists.
   static bool LocaleDataPakExists(const std::string& locale);
 
   // Registers additional data pack files with the global ResourceBundle.  When
   // looking for a DataResource, we will search these files after searching the
-  // main module.  This method is not thread safe!  You should call it
-  // immediately after calling InitSharedInstance.
-  void AddDataPack(const FilePath& path);
+  // main module. |scale_factor| is the scale of images in this resource pak
+  // relative to the images in the 1x resource pak. This method is not thread
+  // safe! You should call it immediately after calling InitSharedInstance.
+  void AddDataPack(const FilePath& path, float scale_factor);
 
   // Changes the locale for an already-initialized ResourceBundle, returning the
   // name of the newly-loaded locale.  Future calls to get strings will return
   // the strings for this new locale.  This has no effect on existing or future
   // image resources.  |locale_resources_data_| is protected by a lock for the
   // duration of the swap, as GetLocalizedString() may be concurrently invoked
   // on another thread.
   std::string ReloadLocaleResources(const std::string& pref_locale);
 
   // Gets the bitmap with the specified resource_id from the current module
@@ skipping 117 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ResourceBundle);
 };
 
 }  // namespace ui
 
 // TODO(beng): Someday, maybe, get rid of this.
 using ui::ResourceBundle;
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_