Added material design mouse hover feedback support.

ui/views/animation/ink_drop_animation_controller.h

Index: ui/views/animation/ink_drop_animation_controller.h
diff --git a/ui/views/animation/ink_drop_animation_controller.h b/ui/views/animation/ink_drop_animation_controller.h
index d4d4fce96bb1a67bdcfd04ef9acab01a9a880ad2..993c85259800d9e7a67965d06bd8914284473d41 100644
--- a/ui/views/animation/ink_drop_animation_controller.h
+++ b/ui/views/animation/ink_drop_animation_controller.h
@@ -21,8 +21,8 @@ class Layer;
 
 namespace views {
 
-// Pure virtual base class that manages an ink drop animation's lifetime and
-// state.
+// Pure virtual base class that manages the lifetime and state of an ink drop
+// animation as well as visual hover state feedback.
 class VIEWS_EXPORT InkDropAnimationController {
  public:
   virtual ~InkDropAnimationController() {}
@@ -33,6 +33,12 @@ class VIEWS_EXPORT InkDropAnimationController {
   // Animates from the current InkDropState to |ink_drop_state|.
   virtual void AnimateToState(InkDropState ink_drop_state) = 0;
 
+  // Enables or disables the hover state.
+  virtual void SetHovered(bool is_hovered) = 0;
+
+  // Returns true if the hover state is enabled.
+  virtual bool IsHovered() const = 0;
+
   virtual gfx::Size GetInkDropLargeSize() const = 0;
 
   // Sets the different sizes of the ink drop.