Trace main thread commit in flow events.

cc/trees/layer_tree_host.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 #include <string>
 
@@ skipping 349 matching lines @@
 
   {
     TRACE_EVENT0("cc", "LayerTreeHost::PushProperties");
     TreeSynchronizer::PushProperties(root_layer(), sync_tree->root_layer());
   }
 
   micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
 }
 
 void LayerTreeHost::WillCommit() {
+  OnCommitForSwapPromises();
   client_->WillCommit();
 }
 
 void LayerTreeHost::UpdateHudLayer() {
   if (debug_state_.ShowHudInfo()) {
     if (!hud_layer_.get()) {
       LayerSettings hud_layer_settings;
       hud_layer_settings.use_compositor_animation_timelines =
           settings_.use_compositor_animation_timelines;
       hud_layer_ = HeadsUpDisplayLayer::Create(hud_layer_settings);
@@ skipping 883 matching lines @@
   DCHECK(swap_promise);
   swap_promise_list_.push_back(swap_promise.Pass());
 }
 
 void LayerTreeHost::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
   for (auto* swap_promise : swap_promise_list_)
     swap_promise->DidNotSwap(reason);
   swap_promise_list_.clear();
 }
 
+void LayerTreeHost::OnCommitForSwapPromises() {
+  for (auto* swap_promise : swap_promise_list_)
+    swap_promise->OnCommit();
+}
+
 void LayerTreeHost::set_surface_id_namespace(uint32_t id_namespace) {
   surface_id_namespace_ = id_namespace;
 }
 
 SurfaceSequence LayerTreeHost::CreateSurfaceSequence() {
   return SurfaceSequence(surface_id_namespace_, next_surface_sequence_++);
 }
 
 void LayerTreeHost::SetChildrenNeedBeginFrames(
     bool children_need_begin_frames) const {
@@ skipping 11 matching lines @@
 }
 
 void LayerTreeHost::RecordFrameTimingEvents(
     scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
     scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) {
   client_->RecordFrameTimingEvents(composite_events.Pass(),
                                    main_frame_events.Pass());
 }
 
 }  // namespace cc