Adding instrumentation to locate the source of jankiness.

net/socket/ssl_client_socket_nss.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.
 
 // This file includes code SSLClientSocketNSS::DoVerifyCertComplete() derived
 // from AuthCertificateCallback() in
 // mozilla/security/manager/ssl/src/nsNSSCallbacks.cpp.
 
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
@@ skipping 2610 matching lines @@
   DCHECK(nss_waiting_write_);
   nss_waiting_write_ = false;
   if (result < 0) {
     nss_is_closed_ = true;
   } else if (result > 0) {
     was_ever_used_ = true;
   }
 }
 
 void SSLClientSocketNSS::Core::BufferSendComplete(int result) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/418183 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "418183 DidCompleteReadWrite => Core::BufferSendComplete"));
+
   if (!OnNSSTaskRunner()) {
     if (detached_)
       return;
 
     nss_task_runner_->PostTask(
         FROM_HERE, base::Bind(&Core::BufferSendComplete, this, result));
     return;
   }
 
   DCHECK(OnNSSTaskRunner());
@@ skipping 23 matching lines @@
 void SSLClientSocketNSS::Core::OnGetChannelIDComplete(int result) {
   DVLOG(1) << __FUNCTION__ << " " << result;
   DCHECK(OnNetworkTaskRunner());
 
   OnHandshakeIOComplete(result);
 }
 
 void SSLClientSocketNSS::Core::BufferRecvComplete(
     IOBuffer* read_buffer,
     int result) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/418183 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "418183 DidCompleteReadWrite => SSLClientSocketNSS::Core::..."));
+
   DCHECK(read_buffer);
 
   if (!OnNSSTaskRunner()) {
     if (detached_)
       return;
 
     nss_task_runner_->PostTask(
         FROM_HERE, base::Bind(&Core::BufferRecvComplete, this,
                               scoped_refptr<IOBuffer>(read_buffer), result));
     return;
@@ skipping 844 matching lines @@
 scoped_refptr<X509Certificate>
 SSLClientSocketNSS::GetUnverifiedServerCertificateChain() const {
   return core_->state().server_cert.get();
 }
 
 ChannelIDService* SSLClientSocketNSS::GetChannelIDService() const {
   return channel_id_service_;
 }
 
 }  // namespace net