Added a nested class to gfx::Animation

ui/gfx/animation/animation.h

 // Copyright (c) 2011 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_GFX_ANIMATION_ANIMATION_H_
 #define UI_GFX_ANIMATION_ANIMATION_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 51 matching lines @@
   // Returns true if rich animations should be rendered.
   // Looks at session type (e.g. remote desktop) and accessibility settings
   // to give guidance for heavy animations such as "start download" arrow.
   static bool ShouldRenderRichAnimation();
 
   // Determines on a per-platform basis whether scroll animations (e.g. produced
   // by home/end key) should be enabled. Should only be called from the browser
   // process.
   static bool ScrollAnimationsEnabledBySystem();
 
+  class AnimationTestApi;

[sky, 2017/07/12 19:16:19]

Make this a top-level class (not inside Animation).

[newcomer, 2017/07/13 21:19:28]

Done.

+
  protected:
   // Invoked from Start to allow subclasses to prepare for the animation.
   virtual void AnimationStarted() {}
 
   // Invoked from Stop after we're removed from the container but before the
   // delegate has been invoked.
   virtual void AnimationStopped() {}
 
   // Invoked from stop to determine if cancel should be invoked. If this returns
   // true the delegate is notified the animation was canceled, otherwise the
@@ skipping 24 matching lines @@
 
   // Time we started at.
   base::TimeTicks start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(Animation);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_ANIMATION_ANIMATION_H_