Instrumenting callbacks of HttpNetworkTransaction to locate the source of jankiness

net/url_request/url_request_http_job.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/url_request/url_request_http_job.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_version_info.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/rand_util.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/load_flags.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/base/network_delegate.h"
 #include "net/base/sdch_manager.h"
@@ skipping 750 matching lines @@
   //   If a UA receives more than one PKP header field in an HTTP
   //   response message over secure transport, then the UA MUST process
   //   only the first such header field.
   HttpResponseHeaders* headers = GetResponseHeaders();
   std::string value;
   if (headers->EnumerateHeader(NULL, "Public-Key-Pins", &value))
     security_state->AddHPKPHeader(request_info_.url.host(), value, ssl_info);
 }
 
 void URLRequestHttpJob::OnStartCompleted(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/424359 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "424359 URLRequestHttpJob::OnStartCompleted"));
+
   RecordTimer();
 
   // If the request was destroyed, then there is no more work to do.
   if (!request_)
     return;
 
   // If the job is done (due to cancellation), can just ignore this
   // notification.
   if (done_)
     return;
@@ skipping 83 matching lines @@
 void URLRequestHttpJob::OnHeadersReceivedCallback(int result) {
   awaiting_callback_ = false;
 
   // Check that there are no callbacks to already canceled requests.
   DCHECK_NE(URLRequestStatus::CANCELED, GetStatus().status());
 
   SaveCookiesAndNotifyHeadersComplete(result);
 }
 
 void URLRequestHttpJob::OnReadCompleted(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/424359 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "424359 URLRequestHttpJob::OnReadCompleted"));
+
   read_in_progress_ = false;
 
   if (ShouldFixMismatchedContentLength(result))
     result = OK;
 
   if (result == OK) {
     NotifyDone(URLRequestStatus());
   } else if (result < 0) {
     NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result));
   } else {
@@ skipping 618 matching lines @@
   return override_response_headers_.get() ?
              override_response_headers_.get() :
              transaction_->GetResponseInfo()->headers.get();
 }
 
 void URLRequestHttpJob::NotifyURLRequestDestroyed() {
   awaiting_callback_ = false;
 }
 
 }  // namespace net