Add scale factor and 2x resources from webkit and plumb through to ContentClient.

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index d979a6e9cfb400bd8cb7b12b76bb6bda66d824dd..3409b2ab6a8a4cf1c5286597695ad40be65bd7f7 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -420,6 +420,14 @@ base::StringPiece ChromeContentClient::GetDataResource(int resource_id) const {
   return ResourceBundle::GetSharedInstance().GetRawDataResource(resource_id);
 }
 
+base::StringPiece ChromeContentClient::GetImageResource(
+    int resource_id,
+    float scale_factor) const {
+  // TODO(flackr): Pass scale_factor to ResourceBundle to get best matching
+  // image resource for the given scale factor.
+  return ResourceBundle::GetSharedInstance().GetRawDataResource(resource_id);
+}
+
 #if defined(OS_WIN)
 bool ChromeContentClient::SandboxPlugin(CommandLine* command_line,
                                         sandbox::TargetPolicy* policy) {