Add trace events for ThreadedDataProvider

content/child/threaded_data_provider.cc

Index: content/child/threaded_data_provider.cc
diff --git a/content/child/threaded_data_provider.cc b/content/child/threaded_data_provider.cc
index 91d385b81ef353ec2dc6c007585d57cdb139b302..2f82a2d19520402c36a4137f73a4ebfe8676233b 100644
--- a/content/child/threaded_data_provider.cc
+++ b/content/child/threaded_data_provider.cc
@@ -112,6 +112,7 @@ void DataProviderMessageFilter::OnReceivedData(int request_id,
                                                int data_offset,
                                                int data_length,
                                                int encoded_data_length) {
+  TRACE_EVENT0("loader", "DataProviderMessageFilter::OnReceivedData");
   DCHECK(io_task_runner_->BelongsToCurrentThread());
   background_thread_.TaskRunner()->PostTask(
       FROM_HERE,
@@ -303,6 +304,8 @@ void ThreadedDataProvider::OnReceivedDataOnBackgroundThread(
 void ThreadedDataProvider::OnReceivedDataOnForegroundThread(
     const char* data, int data_length, int encoded_data_length) {
   DCHECK(ChildThreadImpl::current());
+  TRACE_EVENT0("loader",
+               "ThreadedDataProvider::OnReceivedDataOnForegroundThread");
 
   background_thread_.TaskRunner()->PostTask(
       FROM_HERE, base::Bind(&ThreadedDataProvider::ForwardAndACKData,