Instrumenting IOComplete internals to find jank.

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index 738326a4d7d9440d2ec9e23cfd7557ee1a418ec1..23ede35603af8a27996b2b7f373b920b5830abc7 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -299,6 +299,11 @@ void QuicStreamFactory::Job::OnIOComplete(int rv) {
 
   rv = DoLoop(rv);
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
+  tracked_objects::ScopedTracker tracking_profile1(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "436634 QuicStreamFactory::Job::OnIOComplete1"));

[mmenke, 2014/12/11 20:00:38]

This is done in the other CL, using a different name.

[vadimt, 2014/12/11 20:22:26]

Done.

+
   if (rv != ERR_IO_PENDING && !callback_.is_null()) {
     callback_.Run(rv);
   }