Added material design mouse hover feedback support.

ui/views/animation/button_ink_drop_delegate.cc

Index: ui/views/animation/button_ink_drop_delegate.cc
diff --git a/ui/views/animation/button_ink_drop_delegate.cc b/ui/views/animation/button_ink_drop_delegate.cc
index 2fa6000574b196631b220bde9ca8a3fa8e494b30..40172abaab70d6e68634f47516c923c93e5cd876 100644
--- a/ui/views/animation/button_ink_drop_delegate.cc
+++ b/ui/views/animation/button_ink_drop_delegate.cc
@@ -43,9 +43,24 @@ void ButtonInkDropDelegate::OnAction(InkDropState state) {
   ink_drop_animation_controller_->AnimateToState(state);
 }
 
+void ButtonInkDropDelegate::SetHovered(bool is_hovered) {
+  ink_drop_animation_controller_->SetHovered(is_hovered);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // ui::EventHandler:
 
+void ButtonInkDropDelegate::OnMouseEvent(ui::MouseEvent* event) {
+  switch (event->type()) {
+    case ui::ET_MOUSE_ENTERED:
+    case ui::ET_MOUSE_EXITED:
+      SetHovered(ink_drop_host_->ShouldShowInkDropHover());
+      break;
+    default:
+      return;
+  }
+}
+
 void ButtonInkDropDelegate::OnGestureEvent(ui::GestureEvent* event) {
   InkDropState current_ink_drop_state =
       ink_drop_animation_controller_->GetInkDropState();