Enhanced the InkDropRippleImpl to create/destroy InkDropAnimations as needed.

ui/views/animation/ink_drop_animation.h

Index: ui/views/animation/ink_drop_animation.h
diff --git a/ui/views/animation/ink_drop_animation.h b/ui/views/animation/ink_drop_animation.h
index dd63bb36a9fb7ea06c4cbc3ccf34a2ead15367aa..9e9ff44553e0d682df495acd23593e6b581001bf 100644
--- a/ui/views/animation/ink_drop_animation.h
+++ b/ui/views/animation/ink_drop_animation.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
 #include "base/time/time.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/gfx/geometry/size.h"
@@ -16,12 +17,15 @@
 #include "ui/views/views_export.h"
 
 namespace ui {
+class CallbackLayerAnimationObserver;
 class Layer;
+class LayerAnimationObserver;
 class LayerDelegate;
 }  // namespace ui
 
 namespace views {
 class CircleLayerDelegate;
+class InkDropAnimationObserver;
 class RectangleLayerDelegate;
 
 namespace test {
@@ -48,6 +52,10 @@ class VIEWS_EXPORT InkDropAnimation {
 
   InkDropState ink_drop_state() const { return ink_drop_state_; }
 
+  void AddObserver(InkDropAnimationObserver* observer);
+
+  void RemoveObserver(InkDropAnimationObserver* observer);

[sadrul, 2015/10/08 01:06:01]

- the newline

[bruthig, 2015/10/08 21:42:55]

Done.

+
   // Animates from the current |ink_drop_state_| to a new |ink_drop_state|. It
   // is possible to animate from any |ink_drop_state_| to any new
   // |ink_drop_state|. Note that some state transitions will also perform an
@@ -77,16 +85,24 @@ class VIEWS_EXPORT InkDropAnimation {
   // ink drop.
   typedef gfx::Transform InkDropTransforms[PAINTED_SHAPE_COUNT];
 
+  // Animates the ripple to |ink_drop_state| and attaches |observer| to all
+  // LayerAnimationSequence's used.
+  void AnimateToStateInternal(InkDropState ink_drop_state,
+                              ui::LayerAnimationObserver* observer);
+
   // Animates all of the painted shape layers to the specified |transforms| and
-  // |opacity|.
+  // |opacity|. The animation will use the given |duration| and
+  // |preemption_strategy|, and |observer| will be added to all
+  // LayerAnimationSequences.
   void AnimateToTransforms(
       const InkDropTransforms transforms,
       float opacity,
       base::TimeDelta duration,
-      ui::LayerAnimator::PreemptionStrategy preemption_strategy);
+      ui::LayerAnimator::PreemptionStrategy preemption_strategy,
+      ui::LayerAnimationObserver* observer);
 
-  // Resets the Transforms on all the owned Layers to a minimum size.
-  void ResetTransformsToMinSize();
+  // Updates the Transforms and opacity to the HIDDEN state.
+  void SetStateToHidden();
 
   // Sets the |transforms| on all of the shape layers. Note that this does not
   // perform any animation.
@@ -113,6 +129,20 @@ class VIEWS_EXPORT InkDropAnimation {
   // Adds and configures a new |painted_shape| layer to |painted_layers_|.
   void AddPaintLayer(PaintedShape painted_shape);
 
+  void AbortAllAnimations();
+
+  // The Callback invoked when all of the animation sequences for the specific
+  // |ink_drop_state| animation have started.

[varkha, 2015/10/06 20:58:38]

Can you document |observer|?

[bruthig, 2015/10/08 21:42:55]

Done.

+  void AnimationStartedCallback(
+      InkDropState ink_drop_state,
+      const ui::CallbackLayerAnimationObserver& observer);
+
+  // The Callback invoked when all of the animation sequences for the specific
+  // |ink_drop_state| animation have finished.
+  bool AnimationEndedCallback(
+      InkDropState ink_drop_state,
+      const ui::CallbackLayerAnimationObserver& observer);
+
   // Maximum size that an ink drop will be drawn to for any InkDropState whose
   // final frame should be large.
   gfx::Size large_size_;
@@ -146,6 +176,9 @@ class VIEWS_EXPORT InkDropAnimation {
   // The current ink drop state.
   InkDropState ink_drop_state_;
 
+  // List of observers to notify when animations have finished.
+  base::ObserverList<InkDropAnimationObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(InkDropAnimation);
 };