Add scale factor tag to data packs

ui/base/resource/resource_data_dll_win.cc

 // 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.
 
 #include "ui/base/resource/resource_data_dll_win.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/win/resource_util.h"
 
@@ skipping 30 matching lines @@
     return new base::RefCountedStaticMemory(
         reinterpret_cast<const unsigned char*>(data_ptr), data_size);
   }
   return NULL;
 }
 
 ResourceHandle::TextEncodingType ResourceDataDLL::GetTextEncodingType() const {
   return BINARY;
 }
 
+float ResourceDataDLL::GetScaleFactor() const {
+  return 1.0;
+}
+
 }  // namespace ui