Add UMA for CrossFadeAnimation.

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"
@@ skipping 36 matching lines @@
     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 {
+ public:
+  OverviewEnterMetricsReporter() = default;
+  ~OverviewEnterMetricsReporter() override = default;
+
   void Report(int value) override {
     UMA_HISTOGRAM_PERCENTAGE("Ash.WindowSelector.AnimationSmoothness.Enter",
                              value);
   }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(OverviewEnterMetricsReporter);
 };
 
 class OverviewExitMetricsReporter : public ui::AnimationMetricsReporter {
+ public:
+  OverviewExitMetricsReporter() = default;
+  ~OverviewExitMetricsReporter() override = default;
+
   void Report(int value) override {
     UMA_HISTOGRAM_PERCENTAGE("Ash.WindowSelector.AnimationSmoothness.Exit",
                              value);
   }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(OverviewExitMetricsReporter);
 };
 
 class OverviewCloseMetricsReporter : public ui::AnimationMetricsReporter {
+ public:
+  OverviewCloseMetricsReporter() = default;
+  ~OverviewCloseMetricsReporter() override = default;
+
   void Report(int value) override {
     UMA_HISTOGRAM_PERCENTAGE("Ash.WindowSelector.AnimationSmoothness.Close",
                              value);
   }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(OverviewCloseMetricsReporter);
 };
 
 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(
@@ skipping 60 matching lines @@
 }
 
 ScopedOverviewAnimationSettingsAura::~ScopedOverviewAnimationSettingsAura() {}
 
 void ScopedOverviewAnimationSettingsAura::AddObserver(
     ui::ImplicitAnimationObserver* observer) {
   animation_settings_->AddObserver(observer);
 }
 
 }  // namespace ash