Dispatch transfer size update notification on mojo-loading

content/browser/loader/mojo_async_resource_handler.h

Index: content/browser/loader/mojo_async_resource_handler.h
diff --git a/content/browser/loader/mojo_async_resource_handler.h b/content/browser/loader/mojo_async_resource_handler.h
index 81a2f85a61140d5f7ec0c96435d9da48b3328fc1..894ff848c0c1faf04c7c4f1aa750f6de87ec31a2 100644
--- a/content/browser/loader/mojo_async_resource_handler.h
+++ b/content/browser/loader/mojo_async_resource_handler.h
@@ -91,6 +91,10 @@ class CONTENT_EXPORT MojoAsyncResourceHandler
   bool CheckForSufficientResource();
   void OnWritable(MojoResult result);
   void Cancel();
+  // Calculates the diff between URLRequest::GetTotalReceivedBytes() and
+  // |reported_total_received_bytes_|, returns it, and updates
+  // |reported_total_received_bytes_|.
+  int64_t CalculateRecentlyReceivedBytes();
   // This function can be overriden only for tests.
   virtual void ReportBadMessage(const std::string& error);