Adds plumbing to pass WebUI mojo::Handle from browser to renderer

content/public/browser/web_ui_data_source.h

Index: content/public/browser/web_ui_data_source.h
diff --git a/content/public/browser/web_ui_data_source.h b/content/public/browser/web_ui_data_source.h
index b5cc6d577ba502ead6457bcb4b3162bca8653bf2..ca4c9e89e4f7d89be47e4ec3f7df8773243b3efb 100644
--- a/content/public/browser/web_ui_data_source.h
+++ b/content/public/browser/web_ui_data_source.h
@@ -25,6 +25,14 @@ class WebUIDataSource {
 
   CONTENT_EXPORT static WebUIDataSource* Create(const std::string& source_name);
 
+#if defined(USE_MOJO)
+  // Adds the necessary resources for mojo bindings returning the
+  // WebUIDataSource that handles the resources. Callers do not own the return
+  // value.
+  CONTENT_EXPORT static WebUIDataSource* AddMojoDataSource(
+      BrowserContext* browser_context);
+#endif
+
   // Adds a WebUI data source to |browser_context|.
   CONTENT_EXPORT static void Add(BrowserContext* browser_context,
                                  WebUIDataSource* source);