Select theme resources from ResourceBundle at requested scale factor.

ui/base/resource/data_pack.cc

Index: ui/base/resource/data_pack.cc
diff --git a/ui/base/resource/data_pack.cc b/ui/base/resource/data_pack.cc
index 0fa97a83bd03104425edc2ae2d96b2647cabc2f7..e1d8c144ac54ec21c7f3448c3f9b34a6b713d659 100644
--- a/ui/base/resource/data_pack.cc
+++ b/ui/base/resource/data_pack.cc
@@ -61,7 +61,7 @@ enum LoadErrors {
 
 namespace ui {
 
-DataPack::DataPack(float scale_factor)
+DataPack::DataPack(ui::ScaleFactor scale_factor)
     : resource_count_(0),
       text_encoding_type_(BINARY),
       scale_factor_(scale_factor) {
@@ -145,6 +145,11 @@ bool DataPack::Load(const FilePath& path) {
   return true;
 }
 
+bool DataPack::HasResource(uint16 resource_id) const {
+  return !!bsearch(&resource_id, mmap_->data() + kHeaderLength, resource_count_,
+                   sizeof(DataPackEntry), DataPackEntry::CompareById);
+}
+
 bool DataPack::GetStringPiece(uint16 resource_id,
                               base::StringPiece* data) const {
   // It won't be hard to make this endian-agnostic, but it's not worth
@@ -186,7 +191,7 @@ ResourceHandle::TextEncodingType DataPack::GetTextEncodingType() const {
   return text_encoding_type_;
 }
 
-float DataPack::GetScaleFactor() const {
+ui::ScaleFactor DataPack::GetScaleFactor() const {
   return scale_factor_;
 }