Adding instrumentation 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"
@@ skipping 1002 matching lines @@
   request_info_.upload_data_stream = upload;
 }
 
 void URLRequestHttpJob::SetExtraRequestHeaders(
     const HttpRequestHeaders& headers) {
   DCHECK(!transaction_.get()) << "cannot change once started";
   request_info_.extra_headers.CopyFrom(headers);
 }
 
 LoadState URLRequestHttpJob::GetLoadState() const {
+  // TODO(pkasting): Remove ScopedTracker below once crbug.com/455952 is
+  // fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "455952 URLRequestHttpJob::GetLoadState"));
   return transaction_.get() ?
       transaction_->GetLoadState() : LOAD_STATE_IDLE;
 }
 
 UploadProgress URLRequestHttpJob::GetUploadProgress() const {
   return transaction_.get() ?
       transaction_->GetUploadProgress() : UploadProgress();
 }
 
 bool URLRequestHttpJob::GetMimeType(std::string* mime_type) const {
@@ skipping 565 matching lines @@
   return override_response_headers_.get() ?
              override_response_headers_.get() :
              transaction_->GetResponseInfo()->headers.get();
 }
 
 void URLRequestHttpJob::NotifyURLRequestDestroyed() {
   awaiting_callback_ = false;
 }
 
 }  // namespace net