Select theme resources from ResourceBundle at requested scale factor.

ui/base/resource/resource_handle.h

Index: ui/base/resource/resource_handle.h
diff --git a/ui/base/resource/resource_handle.h b/ui/base/resource/resource_handle.h
index b40741e7599b48537f1e95c21c2ac85d62965500..1d26e720a948a0f5a7bb290b31fa0136c98316ed 100644
--- a/ui/base/resource/resource_handle.h
+++ b/ui/base/resource/resource_handle.h
@@ -8,6 +8,7 @@
 
 #include "base/basictypes.h"
 #include "base/string_piece.h"
+#include "ui/base/layout.h"
 #include "ui/base/ui_export.h"
 
 namespace base {
@@ -25,12 +26,11 @@ class UI_EXPORT ResourceHandle {
     UTF16
   };
 
-  // The scale factors for image resources.
-  static const float kScaleFactor100x;
-  static const float kScaleFactor200x;
-
   virtual ~ResourceHandle() {}
 
+  // Returns true if the DataPack contains a resource with id |resource_id|.
+  virtual bool HasResource(uint16 resource_id) const = 0;
+
   // Get resource by id |resource_id|, filling in |data|.
   // The data is owned by the DataPack object and should not be modified.
   // Returns false if the resource id isn't found.
@@ -47,7 +47,7 @@ class UI_EXPORT ResourceHandle {
 
   // The scale of images in this resource pack relative to images in the 1x
   // resource pak.
-  virtual float GetScaleFactor() const = 0;
+  virtual ScaleFactor GetScaleFactor() const = 0;
 };
 
 }  // namespace ui