Adding ripple effect for clicks on MD slider

ui/views/controls/slider.h

Index: ui/views/controls/slider.h
diff --git a/ui/views/controls/slider.h b/ui/views/controls/slider.h
index e90da3a4ab1ae20426f114e9c184a7dbd6d6bef5..451e1913f80976318d37e96981694f89eda1c76c 100644
--- a/ui/views/controls/slider.h
+++ b/ui/views/controls/slider.h
@@ -72,6 +72,10 @@ class VIEWS_EXPORT Slider : public View, public gfx::AnimationDelegate {
   virtual void UpdateState(bool control_on) = 0;
 
  protected:
+  bool OnMousePressed(const ui::MouseEvent& event) override;
+  void OnMouseReleased(const ui::MouseEvent& event) override;
+
+ protected:
   explicit Slider(SliderListener* listener);
 
   // Returns the current position of the thumb on the slider.
@@ -106,9 +110,7 @@ class VIEWS_EXPORT Slider : public View, public gfx::AnimationDelegate {
   // views::View:
   const char* GetClassName() const override;
   gfx::Size GetPreferredSize() const override;
-  bool OnMousePressed(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
-  void OnMouseReleased(const ui::MouseEvent& event) override;
   bool OnKeyPressed(const ui::KeyEvent& event) override;
   void GetAccessibleState(ui::AXViewState* state) override;
   void OnFocus() override;