[animations] Adds metrics for jank on selected layer animations

ui/compositor/scoped_layer_animation_settings.h

 // 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.
 
 #ifndef UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_
 #define UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "ui/compositor/compositor_export.h"
+#include "ui/compositor/layer_animation_element.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/gfx/animation/tween.h"
 
 namespace ui {
 
 class ImplicitAnimationObserver;
 
 // Scoped settings allow you to temporarily change the animator's settings and
 // these changes are reverted when the object is destroyed. NOTE: when the
 // settings object is created, it applies the default transition duration
 // (200ms).
 class COMPOSITOR_EXPORT ScopedLayerAnimationSettings {
  public:
   explicit ScopedLayerAnimationSettings(scoped_refptr<LayerAnimator> animator);
   virtual ~ScopedLayerAnimationSettings();
 
   void AddObserver(ImplicitAnimationObserver* observer);
 
+  void SetAnimationMetricsReporter(AnimationMetricsReporter* reporter);
   void SetTransitionDuration(base::TimeDelta duration);
   base::TimeDelta GetTransitionDuration() const;
 
   // Locks transition duration in |animator_|. When transition duration
   // is locked any subsequent changes to it are ignored until the
   // ScopedLayerAnimationSettings object that has locked the duration goes out
   // of scope.
   void LockTransitionDuration();
 
   void SetTweenType(gfx::Tween::Type tween_type);
   gfx::Tween::Type GetTweenType() const;
 
   void SetPreemptionStrategy(LayerAnimator::PreemptionStrategy strategy);
   LayerAnimator::PreemptionStrategy GetPreemptionStrategy() const;
 
  private:
   scoped_refptr<LayerAnimator> animator_;
   bool old_is_transition_duration_locked_;
   base::TimeDelta old_transition_duration_;
   gfx::Tween::Type old_tween_type_;
   LayerAnimator::PreemptionStrategy old_preemption_strategy_;
   std::set<ImplicitAnimationObserver*> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedLayerAnimationSettings);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_SCOPED_LAYER_ANIMATION_SETTINGS_H_