[animations] Adds metrics for jank on selected layer animations

ui/compositor/scoped_layer_animation_settings.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 "ui/compositor/scoped_layer_animation_settings.h"
 
 #include <stddef.h>
 
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_observer.h"
@@ skipping 15 matching lines @@
       old_is_transition_duration_locked_(
           animator->is_transition_duration_locked_),
       old_transition_duration_(animator->GetTransitionDuration()),
       old_tween_type_(animator->tween_type()),
       old_preemption_strategy_(animator->preemption_strategy()) {
   SetTransitionDuration(
       base::TimeDelta::FromMilliseconds(kDefaultTransitionDurationMs));
 }
 
 ScopedLayerAnimationSettings::~ScopedLayerAnimationSettings() {
+  animator_->set_animation_metrics_reporter(nullptr);
   animator_->is_transition_duration_locked_ =
       old_is_transition_duration_locked_;
   animator_->SetTransitionDuration(old_transition_duration_);
   animator_->set_tween_type(old_tween_type_);
   animator_->set_preemption_strategy(old_preemption_strategy_);
 
   for (std::set<ImplicitAnimationObserver*>::const_iterator i =
        observers_.begin(); i != observers_.end(); ++i) {
     animator_->observers_.RemoveObserver(*i);
     (*i)->SetActive(true);
   }
 }
 
 void ScopedLayerAnimationSettings::AddObserver(
     ImplicitAnimationObserver* observer) {
   observers_.insert(observer);
   animator_->AddObserver(observer);
 }
 
+void ScopedLayerAnimationSettings::SetAnimationMetricsReporter(
+    AnimationMetricsReporter* reporter) {
+  animator_->set_animation_metrics_reporter(reporter);
+}
+
 void ScopedLayerAnimationSettings::SetTransitionDuration(
     base::TimeDelta duration) {
   animator_->SetTransitionDuration(duration);
 }
 
 void ScopedLayerAnimationSettings::LockTransitionDuration() {
   animator_->is_transition_duration_locked_ = true;
 }
 
 base::TimeDelta ScopedLayerAnimationSettings::GetTransitionDuration() const {
@@ skipping 12 matching lines @@
     LayerAnimator::PreemptionStrategy strategy) {
   animator_->set_preemption_strategy(strategy);
 }
 
 LayerAnimator::PreemptionStrategy
 ScopedLayerAnimationSettings::GetPreemptionStrategy() const {
   return animator_->preemption_strategy();
 }
 
 }  // namespace ui