Dispatch transfer size update notification on mojo-loading

content/child/resource_dispatcher.h

Index: content/child/resource_dispatcher.h
diff --git a/content/child/resource_dispatcher.h b/content/child/resource_dispatcher.h
index 2f918eefb336257e036e9f2120721781bb92d4fa..48a7f574876cfd9b5cdd6bcc03c981a48ad93ce8 100644
--- a/content/child/resource_dispatcher.h
+++ b/content/child/resource_dispatcher.h
@@ -149,6 +149,8 @@ class CONTENT_EXPORT ResourceDispatcher : public IPC::Listener {
     return weak_factory_.GetWeakPtr();
   }
 
+  void OnTransferSizeUpdated(int request_id, int32_t transfer_size_diff);
+
  private:
   friend class URLResponseBodyConsumer;
   friend class ResourceDispatcherTest;