[ash-md] Animates ToggleButton highlight to move it in sync with the thumb

ui/views/animation/ink_drop_host_view.h

Index: ui/views/animation/ink_drop_host_view.h
diff --git a/ui/views/animation/ink_drop_host_view.h b/ui/views/animation/ink_drop_host_view.h
index 2f30b24b3b7e5eb6df158dcd839f7f634ede875e..0420588e6d5d5706ad3db64a9c3c83541034e2bc 100644
--- a/ui/views/animation/ink_drop_host_view.h
+++ b/ui/views/animation/ink_drop_host_view.h
@@ -34,6 +34,7 @@ class VIEWS_EXPORT InkDropHostView : public View, public InkDropHost {
   void RemoveInkDropLayer(ui::Layer* ink_drop_layer) override;
   std::unique_ptr<InkDropRipple> CreateInkDropRipple() const override;
   std::unique_ptr<InkDropHighlight> CreateInkDropHighlight() const override;
+  void OffsetInkDropRipple(const gfx::Vector2d& offset) override;
 
   void set_ink_drop_size(const gfx::Size& size) { ink_drop_size_ = size; }
 
@@ -110,6 +111,9 @@ class VIEWS_EXPORT InkDropHostView : public View, public InkDropHost {
   // destroyed |ink_drop_| during destruction.
   std::unique_ptr<InkDropGestureHandler> gesture_handler_;
 
+  // Cached ink drop layer.
+  ui::Layer* ink_drop_layer_;
+
   gfx::Size ink_drop_size_;
 
   float ink_drop_visible_opacity_;