Adding instrumentation to locate the source of jankiness.

net/spdy/spdy_session.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/spdy/spdy_session.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/metrics/stats_counters.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "crypto/ec_private_key.h"
 #include "crypto/ec_signature_creator.h"
 #include "net/base/connection_type_histograms.h"
@@ skipping 1300 matching lines @@
 
   DCHECK(buffered_spdy_framer_.get());
   scoped_ptr<SpdyFrame> rst_frame(
       buffered_spdy_framer_->CreateRstStream(stream_id, status));
 
   EnqueueSessionWrite(priority, RST_STREAM, rst_frame.Pass());
   RecordProtocolErrorHistogram(MapRstStreamStatusToProtocolError(status));
 }
 
 void SpdySession::PumpReadLoop(ReadState expected_read_state, int result) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/418183 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "418183 DoReadCallback => SpdySession::PumpReadLoop"));
+
   CHECK(!in_io_loop_);
   if (availability_state_ == STATE_DRAINING) {
     return;
   }
   ignore_result(DoReadLoop(expected_read_state, result));
 }
 
 int SpdySession::DoReadLoop(ReadState expected_read_state, int result) {
   CHECK(!in_io_loop_);
   CHECK_EQ(read_state_, expected_read_state);
@@ skipping 1903 matching lines @@
     if (!queue->empty()) {
       SpdyStreamId stream_id = queue->front();
       queue->pop_front();
       return stream_id;
     }
   }
   return 0;
 }
 
 }  // namespace net