[animations] Adds metrics for jank on selected layer animations

ui/compositor/scoped_layer_animation_settings.cc

Index: ui/compositor/scoped_layer_animation_settings.cc
diff --git a/ui/compositor/scoped_layer_animation_settings.cc b/ui/compositor/scoped_layer_animation_settings.cc
index 5688d3cf05dc7ae5896be2deb8bacad9ba876d5e..71db455afb0cb87781f7f2c70baf75f33527ef64 100644
--- a/ui/compositor/scoped_layer_animation_settings.cc
+++ b/ui/compositor/scoped_layer_animation_settings.cc
@@ -33,6 +33,7 @@ ScopedLayerAnimationSettings::ScopedLayerAnimationSettings(
 }
 
 ScopedLayerAnimationSettings::~ScopedLayerAnimationSettings() {
+  animator_->set_animation_metrics_reporter(nullptr);
   animator_->is_transition_duration_locked_ =
       old_is_transition_duration_locked_;
   animator_->SetTransitionDuration(old_transition_duration_);
@@ -52,6 +53,11 @@ void ScopedLayerAnimationSettings::AddObserver(
   animator_->AddObserver(observer);
 }
 
+void ScopedLayerAnimationSettings::SetAnimationMetricsReporter(
+    AnimationMetricsReporter* reporter) {
+  animator_->set_animation_metrics_reporter(reporter);
+}
+
 void ScopedLayerAnimationSettings::SetTransitionDuration(
     base::TimeDelta duration) {
   animator_->SetTransitionDuration(duration);