Adding instrumentation to locate the source of jankiness.

net/url_request/url_request_ftp_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_ftp_job.h"
 
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 267 matching lines @@
         base::Bind(&URLRequestFtpJob::OnStartCompleted,
                    base::Unretained(this)));
   }
   if (rv == ERR_IO_PENDING)
     return;
 
   OnStartCompletedAsync(rv);
 }
 
 LoadState URLRequestFtpJob::GetLoadState() const {
+  // TODO(pkasting): Remove ScopedTracker below once crbug.com/455952 is
+  // fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "455952 URLRequestFtpJob::GetLoadState"));
   if (proxy_info_.is_direct()) {
     return ftp_transaction_ ?
         ftp_transaction_->GetLoadState() : LOAD_STATE_IDLE;
   } else {
     return http_transaction_ ?
         http_transaction_->GetLoadState() : LOAD_STATE_IDLE;
   }
 }
 
 bool URLRequestFtpJob::NeedsAuth() {
@@ skipping 107 matching lines @@
   if (cached_auth) {
     // Retry using cached auth data.
     SetAuth(cached_auth->credentials);
   } else {
     // Prompt for a username/password.
     NotifyHeadersComplete();
   }
 }
 
 }  // namespace net