Add profiling to track jank in ResourceDispatcherHostImpl::UpdateLoadInfoOnUIThread.

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 2112 matching lines @@
 
   if (a_uploading_size != b_uploading_size)
     return a_uploading_size > b_uploading_size;
 
   return a.load_state.state > b.load_state.state;
 }
 
 // static
 void ResourceDispatcherHostImpl::UpdateLoadInfoOnUIThread(
     scoped_ptr<LoadInfoMap> info_map) {
+  // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466285
+  // is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "466285 ResourceDispatcherHostImpl::UpdateLoadInfoOnUIThread"));
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   for (const auto& load_info : *info_map) {
     RenderViewHostImpl* view = RenderViewHostImpl::FromID(
         load_info.first.child_id, load_info.first.route_id);
     // The view could be gone at this point.
     if (view) {
       view->LoadStateChanged(load_info.second.url, load_info.second.load_state,
                              load_info.second.upload_position,
                              load_info.second.upload_size);
     }
@@ skipping 209 matching lines @@
 
   // Add a flag to selectively bypass the data reduction proxy if the resource
   // type is not an image.
   if (request_data.resource_type != RESOURCE_TYPE_IMAGE)
     load_flags |= net::LOAD_BYPASS_DATA_REDUCTION_PROXY;
 
   return load_flags;
 }
 
 }  // namespace content