Adding instrumentation to locate the source of jankiness.

net/url_request/url_request_data_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.
 
 // Simple implementation of a data: protocol handler.
 
 #include "net/url_request/url_request_data_job.h"
 
+#include "base/profiler/scoped_profile.h"
 #include "net/base/data_url.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
 #include "url/gurl.h"
 
 namespace net {
 
 int URLRequestDataJob::BuildResponse(const GURL& url,
                                      std::string* mime_type,
                                      std::string* charset,
@@ skipping 26 matching lines @@
 
 URLRequestDataJob::URLRequestDataJob(
     URLRequest* request, NetworkDelegate* network_delegate)
     : URLRequestSimpleJob(request, network_delegate) {
 }
 
 int URLRequestDataJob::GetData(std::string* mime_type,
                                std::string* charset,
                                std::string* data,
                                const CompletionCallback& callback) const {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422489 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("422489 URLRequestDataJob::GetData"));
+
   // Check if data URL is valid. If not, don't bother to try to extract data.
   // Otherwise, parse the data from the data URL.
   const GURL& url = request_->url();
   if (!url.is_valid())
     return ERR_INVALID_URL;
 
   // TODO(tyoshino): Get the headers and export via
   // URLRequestJob::GetResponseInfo().
   return BuildResponse(url, mime_type, charset, data, NULL);
 }
 
 URLRequestDataJob::~URLRequestDataJob() {
 }
 
 }  // namespace net