Added material design mouse hover feedback support.

chrome/browser/ui/views/bar_control_button.cc

Index: chrome/browser/ui/views/bar_control_button.cc
diff --git a/chrome/browser/ui/views/bar_control_button.cc b/chrome/browser/ui/views/bar_control_button.cc
index 0e4336d5533964aabfe476257ce75bcf48ac4f9f..1b57d5e8738feb38d38f1247490a344e9b2bf50a 100644
--- a/chrome/browser/ui/views/bar_control_button.cc
+++ b/chrome/browser/ui/views/bar_control_button.cc
@@ -23,7 +23,7 @@ BarControlButton::BarControlButton(views::ButtonListener* listener)
       id_(gfx::VectorIconId::VECTOR_ICON_NONE),
       ink_drop_animation_controller_(
           views::InkDropAnimationControllerFactory::
-              CreateInkDropAnimationController(this)) {
+              CreateInkDropAnimationController(this, this)) {
   const int kInkDropLargeSize = 32;
   const int kInkDropLargeCornerRadius = 4;
   const int kInkDropSmallSize = 24;
@@ -129,9 +129,25 @@ void BarControlButton::OnMouseReleased(const ui::MouseEvent& event) {
   ImageButton::OnMouseReleased(event);
 }
 
+void BarControlButton::OnMouseEntered(const ui::MouseEvent& event) {
+  UpdateInkDropHoverState();
+}
+
+void BarControlButton::OnMouseExited(const ui::MouseEvent& event) {
+  UpdateInkDropHoverState();
+}
+
 void BarControlButton::NotifyClick(const ui::Event& event) {
   ink_drop_animation_controller_->AnimateToState(
       views::InkDropState::QUICK_ACTION);
 
   ImageButton::NotifyClick(event);
 }
+
+void BarControlButton::OnEnabledChanged() {
+  UpdateInkDropHoverState();
+}
+
+void BarControlButton::UpdateInkDropHoverState() {
+  ink_drop_animation_controller_->SetHovered(ShouldShowInkDropHover());
+}