Add scale factor tag to data packs

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index 13aaacf68daa1bdef390d6c9773c616e52e5d8da..9d54da80a39b635433f672704a52f44f45e4d7e4 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -89,9 +89,10 @@ bool ResourceBundle::LocaleDataPakExists(const std::string& locale) {
   return !GetLocaleFilePath(locale).empty();
 }
 
-void ResourceBundle::AddDataPack(const FilePath& path) {
+void ResourceBundle::AddDataPack(const FilePath& path, float scale_factor) {
   scoped_ptr<DataPack> data_pack(new DataPack());
   if (data_pack->Load(path)) {
+    data_pack->set_scale_factor(scale_factor);
     data_packs_.push_back(data_pack.release());
   } else {
     LOG(ERROR) << "Failed to load " << path.value()