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

ui/views/controls/button/toggle_button.h

Index: ui/views/controls/button/toggle_button.h
diff --git a/ui/views/controls/button/toggle_button.h b/ui/views/controls/button/toggle_button.h
index 347d1d050a3e99dbb6ef0625ec8d88ddc0b09173..3449c39b47ccb4c7100c8dd4f98fa52e62baaedc 100644
--- a/ui/views/controls/button/toggle_button.h
+++ b/ui/views/controls/button/toggle_button.h
@@ -27,6 +27,7 @@ class VIEWS_EXPORT ToggleButton : public CustomButton {
   void OnPaint(gfx::Canvas* canvas) override;
   void NotifyClick(const ui::Event& event) override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
+  void AddInkDropLayer(ui::Layer* ink_drop_layer) override;
   std::unique_ptr<InkDropRipple> CreateInkDropRipple() const override;
   SkColor GetInkDropBaseColor() const override;
   bool ShouldShowInkDropHighlight() const override;
@@ -40,6 +41,9 @@ class VIEWS_EXPORT ToggleButton : public CustomButton {
   bool is_on_;
   gfx::SlideAnimation slide_animation_;
 
+  // Keeps track of the thumb position when ink ripple highlight is created.
+  gfx::Point original_center_point_;
+
   DISALLOW_COPY_AND_ASSIGN(ToggleButton);
 };