Added material design mouse hover feedback support.

ui/views/animation/ink_drop_animation_controller_impl.h

Index: ui/views/animation/ink_drop_animation_controller_impl.h
diff --git a/ui/views/animation/ink_drop_animation_controller_impl.h b/ui/views/animation/ink_drop_animation_controller_impl.h
index 5ca25633ba16cb6687e34b07ac96af79fdb7ad75..4aa11dd8394fd4aa580d3b8530ee4a2cd9a516fe 100644
--- a/ui/views/animation/ink_drop_animation_controller_impl.h
+++ b/ui/views/animation/ink_drop_animation_controller_impl.h
@@ -15,6 +15,7 @@
 namespace views {
 class InkDropAnimation;
 class InkDropHost;
+class InkDropHover;
 
 // A functional implementation of an InkDropAnimationController.
 class VIEWS_EXPORT InkDropAnimationControllerImpl
@@ -29,6 +30,8 @@ class VIEWS_EXPORT InkDropAnimationControllerImpl
   // InkDropAnimationController:
   InkDropState GetInkDropState() const override;
   void AnimateToState(InkDropState ink_drop_state) override;
+  void SetHovered(bool is_hovered) override;
+  bool IsHovered() const override;
   gfx::Size GetInkDropLargeSize() const override;
   void SetInkDropSize(const gfx::Size& large_size,
                       int large_corner_radius,
@@ -45,6 +48,13 @@ class VIEWS_EXPORT InkDropAnimationControllerImpl
   // Destroys the current |ink_drop_animation_|.
   void DestroyInkDropAnimation();
 
+  // Creates a new InkDropHover and sets it to |hover_|. If |hover_| wasn't null
+  // then it will be destroyed using DestroyInkDropHover().
+  void CreateInkDropHover();
+
+  // Destroys the current |hover_|.
+  void DestroyInkDropHover();
+
   // views::InkDropAnimationObserver:
   void InkDropAnimationStarted(InkDropState ink_drop_state) override;
   void InkDropAnimationEnded(InkDropState ink_drop_state,
@@ -68,6 +78,19 @@ class VIEWS_EXPORT InkDropAnimationControllerImpl
   // Cached center point for the ink drop.
   gfx::Point ink_drop_center_;
 
+  // The root Layer that parents the InkDropAnimation layers and the
+  // InkDropHover layers. The |root_layer_| is the one that is added and removed
+  // from the InkDropHost.
+  scoped_ptr<ui::Layer> root_layer_;
+
+  // The current InkDropHover. Lazily created using CreateInkDropHover();
+  scoped_ptr<InkDropHover> hover_;
+
+  // Tracks whether the ink drop is currently in a hover state or not. Note this
+  // will not always have the same value as |hover_|->is_hovered() because the
+  // hover layer is faded out when the ink drop ripple is active.
+  bool is_hovered_;
+
   // The current InkDropAnimation. Created on demand using
   // CreateInkDropAnimation().
   scoped_ptr<InkDropAnimation> ink_drop_animation_;