Added a views::test::TestInkDropAnimationObserverHelper

ui/views/animation/ink_drop_animation_observer.h

 // Copyright 2015 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_VIEWS_ANIMATION_INK_DROP_ANIMATION_OBSERVER_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_OBSERVER_H_
 
 #include <string>
 
 #include "base/macros.h"
+#include "ui/views/animation/ink_drop_animation_ended_reason.h"
 #include "ui/views/animation/ink_drop_state.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
-// Pure-virtual base class of an observer that can be attached to
-// InkDropAnimations.
+// Observer to attach to an InkDropAnimation.
 class VIEWS_EXPORT InkDropAnimationObserver {
  public:
-  // Enumeration of the different reasons why an InkDropAnimation has finished.
-  enum InkDropAnimationEndedReason {
-    // The animation was completed successfully.
-    SUCCESS,
-    // The animation was stopped prematurely before reaching its final state.
-    PRE_EMPTED
-  };
+  // An animation for the given |ink_drop_state| has started.
+  virtual void AnimationStarted(InkDropState ink_drop_state) = 0;
 
-  // Notifies the observer that an animation for |ink_drop_state| has started.
-  virtual void InkDropAnimationStarted(InkDropState ink_drop_state) = 0;
-
-  // Notifies the observer that an animation for |ink_drop_state| has finished
-  // and the reason for completion is given by |reason|. If |reason| is SUCCESS
-  // then the animation has progressed to its final frame however if |reason|
-  // is |PRE_EMPTED| then the animation was stopped before its final frame. In
-  // the event that an animation is in progress for ink drop state 's1' and an
-  // animation to a new state 's2' is triggered, then
-  // InkDropAnimationEnded(s1, PRE_EMPTED) will be called before
-  // InkDropAnimationStarted(s2).
-  virtual void InkDropAnimationEnded(InkDropState ink_drop_state,
-                                     InkDropAnimationEndedReason reason) = 0;
+  // Notifies the observer that an animation for the given |ink_drop_state| has
+  // finished and the reason for completion is given by |reason|. If |reason| is
+  // SUCCESS then the animation has progressed to its final frame however if
+  // |reason| is |PRE_EMPTED| then the animation was stopped before its final
+  // frame.
+  virtual void AnimationEnded(InkDropState ink_drop_state,
+                              InkDropAnimationEndedReason reason) = 0;
 
  protected:
   InkDropAnimationObserver() {}
   virtual ~InkDropAnimationObserver() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InkDropAnimationObserver);
 };
 
-// Returns a human readable string for |reason|.  Useful for logging.
-std::string ToString(
-    InkDropAnimationObserver::InkDropAnimationEndedReason reason);
-
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_OBSERVER_H_