Add support for multi resolution icons

ui/base/resource/resource_bundle.h

Index: ui/base/resource/resource_bundle.h
diff --git a/ui/base/resource/resource_bundle.h b/ui/base/resource/resource_bundle.h
index d9731032d1484bcc1f88f84214ca50f5aeb3e2d1..a8cc69de3c9ae6f6eb8e36474ddbedf3745dfafa 100644
--- a/ui/base/resource/resource_bundle.h
+++ b/ui/base/resource/resource_bundle.h
@@ -232,6 +232,8 @@ class ResourceBundle {
   // Returns the full pathname of the main resources file to load.  May return
   // an empty string if no main resources data files are found.
   static FilePath GetResourcesFilePath();
+
+  static FilePath GetLargeIconResourcesFilePath();
 #endif
 
   // Returns the full pathname of the locale file to load.  May return an empty
@@ -260,6 +262,7 @@ class ResourceBundle {
 
   // Handles for data sources.
   DataHandle resources_data_;
+  DataHandle large_icon_resources_data_;
   DataHandle locale_resources_data_;
 
   // References to extra data packs loaded via AddDataPackToSharedInstance.