Dispatch transfer size update notification on mojo-loading

content/browser/loader/test_url_loader_client.cc

Index: content/browser/loader/test_url_loader_client.cc
diff --git a/content/browser/loader/test_url_loader_client.cc b/content/browser/loader/test_url_loader_client.cc
index f3720eed23a3eb1643eda1e4ad68517c7156522e..d87ee132ce21179e89e940a4f7ef35d9ac3a8d61 100644
--- a/content/browser/loader/test_url_loader_client.cc
+++ b/content/browser/loader/test_url_loader_client.cc
@@ -45,6 +45,11 @@ void TestURLLoaderClient::OnDataDownloaded(int64_t data_length,
     quit_closure_for_on_data_downloaded_.Run();
 }
 
+void TestURLLoaderClient::OnTransferSizeUpdated(int32_t transfer_size_diff) {
+  EXPECT_GT(transfer_size_diff, 0);
+  body_transfer_size_ += transfer_size_diff;
+}
+
 void TestURLLoaderClient::OnStartLoadingResponseBody(
     mojo::ScopedDataPipeConsumerHandle body) {
   response_body_ = std::move(body);