Implement upload progress handling in Mojo loading

content/child/url_loader_client_impl.cc

Index: content/child/url_loader_client_impl.cc
diff --git a/content/child/url_loader_client_impl.cc b/content/child/url_loader_client_impl.cc
index f64ff5ea49cee4cf09d411443686b2e1c487318d..bb5eeba4593f040301504e443611b5e68342a528 100644
--- a/content/child/url_loader_client_impl.cc
+++ b/content/child/url_loader_client_impl.cc
@@ -178,4 +178,12 @@ void URLLoaderClientImpl::Dispatch(const IPC::Message& message) {
   }
 }
 
+void URLLoaderClientImpl::OnUploadProgress(int64_t current_position,
+                                           int64_t total_size,
+                                           const base::Closure& ack_callback) {
+  Dispatch(
+      ResourceMsg_UploadProgress(request_id_, current_position, total_size));
+  ack_callback.Run();
+}
+
 }  // namespace content