Adding instrumentation to locate the source of jankiness.

components/policy/core/common/cloud/device_management_service.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 "components/policy/core/common/cloud/device_management_service.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/profiler/scoped_profile.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_status.h"
 #include "url/gurl.h"
 
 namespace em = enterprise_management;
@@ skipping 450 matching lines @@
   pending_jobs_[fetcher] = job;
   fetcher->Start();
 }
 
 std::string DeviceManagementService::GetServerUrl() {
   return configuration_->GetServerUrl();
 }
 
 void DeviceManagementService::OnURLFetchComplete(
     const net::URLFetcher* source) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422577 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422577 DeviceManagementService::OnURLFetchComplete"));
+
   JobFetcherMap::iterator entry(pending_jobs_.find(source));
   if (entry == pending_jobs_.end()) {
     NOTREACHED() << "Callback from foreign URL fetcher";
     return;
   }
 
   DeviceManagementRequestJobImpl* job = entry->second;
   pending_jobs_.erase(entry);
 
   if (job->ShouldRetry(source)) {
@@ skipping 27 matching lines @@
     }
   }
 
   const JobQueue::iterator elem =
       std::find(queued_jobs_.begin(), queued_jobs_.end(), job);
   if (elem != queued_jobs_.end())
     queued_jobs_.erase(elem);
 }
 
 }  // namespace policy