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

content/shell/shell_content_client.cc

Index: content/shell/shell_content_client.cc
diff --git a/content/shell/shell_content_client.cc b/content/shell/shell_content_client.cc
index 64ee8eadf960c3a2cdb622a8dd2e23255ca9f2a7..e3c80d849cf85de50df9b5520977704d9c7327b0 100644
--- a/content/shell/shell_content_client.cc
+++ b/content/shell/shell_content_client.cc
@@ -56,6 +56,14 @@ base::StringPiece ShellContentClient::GetDataResource(int resource_id) const {
   return ResourceBundle::GetSharedInstance().GetRawDataResource(resource_id);
 }
 
+base::StringPiece ShellContentClient::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 ShellContentClient::SandboxPlugin(CommandLine* command_line,
                                        sandbox::TargetPolicy* policy) {