Add profiling to track jank in ResourceDispatcherHostImpl::UpdateLoadInfoOnUIThread.

content/browser/web_contents/web_contents_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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "content/browser/accessibility/accessibility_mode_helper.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/browser/browser_plugin/browser_plugin_embedder.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
@@ skipping 1021 matching lines @@
 base::TerminationStatus WebContentsImpl::GetCrashedStatus() const {
   return crashed_status_;
 }
 
 bool WebContentsImpl::IsBeingDestroyed() const {
   return is_being_destroyed_;
 }
 
 void WebContentsImpl::NotifyNavigationStateChanged(
     InvalidateTypes changed_flags) {
+  // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466285
+  // is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "466285 WebContentsImpl::NotifyNavigationStateChanged"));
   // Create and release the audio power save blocker depending on whether the
   // tab is actively producing audio or not.
   if ((changed_flags & INVALIDATE_TYPE_TAB) &&
       audio_state_provider_->IsAudioStateAvailable()) {
     if (WasRecentlyAudible()) {
       if (!audio_power_save_blocker_)
         CreateAudioPowerSaveBlocker();
     } else {
       audio_power_save_blocker_.reset();
     }
@@ skipping 3117 matching lines @@
 void WebContentsImpl::RendererResponsive(RenderViewHost* render_view_host) {
   if (delegate_)
     delegate_->RendererResponsive(this);
 }
 
 void WebContentsImpl::LoadStateChanged(
     const GURL& url,
     const net::LoadStateWithParam& load_state,
     uint64 upload_position,
     uint64 upload_size) {
+  // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466285
+  // is fixed.
+  tracked_objects::ScopedTracker tracking_profile1(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "466285 WebContentsImpl::LoadStateChanged::Start"));
   load_state_ = load_state;
   upload_position_ = upload_position;
   upload_size_ = upload_size;
   load_state_host_ = net::IDNToUnicode(url.host(),
       GetContentClient()->browser()->GetAcceptLangs(
           GetBrowserContext()));
   if (load_state_.state == net::LOAD_STATE_READING_RESPONSE)
     SetNotWaitingForResponse();
   if (IsLoading()) {
     NotifyNavigationStateChanged(static_cast<InvalidateTypes>(
@@ skipping 383 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content