Add scale factor tag to data packs

ui/base/resource/resource_data_dll_win.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_DATA_DLL_WIN_H_
 #define UI_BASE_RESOURCE_RESOURCE_DATA_DLL_WIN_H_
 #pragma once
 
 #include <windows.h>
 
 #include "base/compiler_specific.h"
 #include "ui/base/resource/resource_handle.h"
 
 namespace ui {
 
 class ResourceDataDLL : public ResourceHandle {
  public:
   explicit ResourceDataDLL(HINSTANCE module);
   virtual ~ResourceDataDLL();
 
   // ResourceHandle implementation:
   virtual bool GetStringPiece(uint16 resource_id,
                               base::StringPiece* data) const OVERRIDE;
   virtual base::RefCountedStaticMemory* GetStaticMemory(
       uint16 resource_id) const OVERRIDE;
   virtual TextEncodingType GetTextEncodingType() const OVERRIDE;
+  virtual float GetScaleFactor() const OVERRIDE;
 
  private:
   const HINSTANCE module_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDataDLL);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_DATA_DLL_WIN_H_