[animations] Adds metrics for jank on selected layer animations

ash/wm/overview/scoped_overview_animation_settings_aura.cc

 // Copyright 2014 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 "ash/wm/overview/scoped_overview_animation_settings_aura.h"
 
+#include "base/lazy_instance.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/time/time.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/animation/tween.h"
 
 namespace ash {
 
 namespace {
@@ skipping 27 matching lines @@
       return base::TimeDelta::FromMilliseconds(kTransitionMilliseconds);
     case OVERVIEW_ANIMATION_CLOSING_SELECTOR_ITEM:
       return base::TimeDelta::FromMilliseconds(kCloseScaleMilliseconds);
     case OVERVIEW_ANIMATION_CLOSE_SELECTOR_ITEM:
       return base::TimeDelta::FromMilliseconds(kCloseFadeOutMilliseconds);
   }
   NOTREACHED();
   return base::TimeDelta();
 }
 
+class OverviewEnterMetricsReporter : public ui::AnimationMetricsReporter {
+  void Report(int value) override {
+    UMA_HISTOGRAM_PERCENTAGE("Ash.WindowSelector.AnimationSmoothness.Enter",
+                             value);
+  }
+};
+
+class OverviewExitMetricsReporter : public ui::AnimationMetricsReporter {
+  void Report(int value) override {
+    UMA_HISTOGRAM_PERCENTAGE("Ash.WindowSelector.AnimationSmoothness.Exit",
+                             value);
+  }
+};
+
+class OverviewCloseMetricsReporter : public ui::AnimationMetricsReporter {
+  void Report(int value) override {
+    UMA_HISTOGRAM_PERCENTAGE("Ash.WindowSelector.AnimationSmoothness.Close",
+                             value);
+  }
+};
+
+base::LazyInstance<OverviewEnterMetricsReporter>::Leaky g_reporter_enter =
+    LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<OverviewExitMetricsReporter>::Leaky g_reporter_exit =
+    LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<OverviewCloseMetricsReporter>::Leaky g_reporter_close =
+    LAZY_INSTANCE_INITIALIZER;
+
+ui::AnimationMetricsReporter* GetMetricsReporter(
+    OverviewAnimationType animation_type) {
+  switch (animation_type) {
+    case OVERVIEW_ANIMATION_NONE:
+      return nullptr;
+    case OVERVIEW_ANIMATION_ENTER_OVERVIEW_MODE_FADE_IN:
+    case OVERVIEW_ANIMATION_LAY_OUT_SELECTOR_ITEMS:
+      return g_reporter_enter.Pointer();
+    case OVERVIEW_ANIMATION_EXIT_OVERVIEW_MODE_FADE_OUT:
+    case OVERVIEW_ANIMATION_RESTORE_WINDOW:
+      return g_reporter_exit.Pointer();
+    case OVERVIEW_ANIMATION_CLOSING_SELECTOR_ITEM:
+    case OVERVIEW_ANIMATION_CLOSE_SELECTOR_ITEM:
+      return g_reporter_close.Pointer();
+  }
+  NOTREACHED();
+  return nullptr;
+}
+
 }  // namespace
 
 ScopedOverviewAnimationSettingsAura::ScopedOverviewAnimationSettingsAura(
     OverviewAnimationType animation_type,
     aura::Window* window)
     : animation_settings_(new ui::ScopedLayerAnimationSettings(
           window->layer()->GetAnimator())) {
   switch (animation_type) {
     case OVERVIEW_ANIMATION_NONE:
       animation_settings_->SetPreemptionStrategy(
@@ skipping 20 matching lines @@
       break;
     case OVERVIEW_ANIMATION_CLOSING_SELECTOR_ITEM:
     case OVERVIEW_ANIMATION_CLOSE_SELECTOR_ITEM:
       animation_settings_->SetPreemptionStrategy(
           ui::LayerAnimator::ENQUEUE_NEW_ANIMATION);
       animation_settings_->SetTweenType(gfx::Tween::EASE_OUT);
       break;
   }
   animation_settings_->SetTransitionDuration(
       GetAnimationDuration(animation_type));
+  animation_settings_->SetAnimationMetricsReporter(
+      GetMetricsReporter(animation_type));
 }
 
 ScopedOverviewAnimationSettingsAura::~ScopedOverviewAnimationSettingsAura() {}
 
 void ScopedOverviewAnimationSettingsAura::AddObserver(
     ui::ImplicitAnimationObserver* observer) {
   animation_settings_->AddObserver(observer);
 }
 
 }  // namespace ash