[animations] Adds metrics for jank on selected layer animations

ui/compositor/layer.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/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 1064 matching lines @@
 
 float Layer::GetDeviceScaleFactor() const {
   return device_scale_factor_;
 }
 
 LayerAnimatorCollection* Layer::GetLayerAnimatorCollection() {
   Compositor* compositor = GetCompositor();
   return compositor ? compositor->layer_animator_collection() : NULL;
 }
 
+int Layer::GetFrameNumber() const {
+  const Compositor* compositor = GetCompositor();
+  return compositor ? compositor->committed_frame_number() : 0;
+}
+
+float Layer::GetRefreshRate() const {
+  const Compositor* compositor = GetCompositor();
+  return compositor ? compositor->refresh_rate() : 60.0;
+}
+
 cc::Layer* Layer::GetCcLayer() const {
   return cc_layer_;
 }
 
 LayerThreadedAnimationDelegate* Layer::GetThreadedAnimationDelegate() {
   DCHECK(animator_);
   return animator_.get();
 }
 
 void Layer::CreateCcLayer() {
@@ skipping 71 matching lines @@
   const auto it = std::find_if(mirrors_.begin(), mirrors_.end(),
       [mirror](const std::unique_ptr<LayerMirror>& mirror_ptr) {
         return mirror_ptr.get() == mirror;
       });
 
   DCHECK(it != mirrors_.end());
   mirrors_.erase(it);
 }
 
 }  // namespace ui