Update webkit_resources to support high-dpi assets

ui/base/resource/resource_bundle_mac.mm

Index: ui/base/resource/resource_bundle_mac.mm
diff --git a/ui/base/resource/resource_bundle_mac.mm b/ui/base/resource/resource_bundle_mac.mm
index 4c46218b6213cb148dd6d4fe117c7c740adef756..bafd94f0e426d42b56525fd0fe94f827b134ab47 100644
--- a/ui/base/resource/resource_bundle_mac.mm
+++ b/ui/base/resource/resource_bundle_mac.mm
@@ -55,6 +55,8 @@ void ResourceBundle::LoadCommonResources() {
                         nil), SCALE_FACTOR_100P);
   AddDataPackFromPath(GetResourcesPakFilePath(@"ui_resources_100_percent",
                         nil), SCALE_FACTOR_100P);
+  AddDataPackFromPath(GetResourcesPakFilePath(@"webkit_resources_100_percent",
+                        nil), SCALE_FACTOR_100P);
 
   // On Windows and ChromeOS we load either the 1x resource or the 2x resource.
   // On Mac we load both and let the UI framework decide which one to use.
@@ -64,6 +66,8 @@ void ResourceBundle::LoadCommonResources() {
                           nil), SCALE_FACTOR_200P);
     AddDataPackFromPath(GetResourcesPakFilePath(@"ui_resources_200_percent",
                           nil), SCALE_FACTOR_200P);
+    AddDataPackFromPath(GetResourcesPakFilePath(@"webkit_resources_200_percent",
+                          nil), SCALE_FACTOR_200P);
   }
 #endif
 }