Harmony: disable ripples on Mac

ui/views/style/platform_style.h

Index: ui/views/style/platform_style.h
diff --git a/ui/views/style/platform_style.h b/ui/views/style/platform_style.h
index 16d10b266fb9a23886e85fc5412952f2d1a5e4d9..dadf7a34d712e7ec085846712525fab48ce613cc 100644
--- a/ui/views/style/platform_style.h
+++ b/ui/views/style/platform_style.h
@@ -53,6 +53,9 @@ class VIEWS_EXPORT PlatformStyle {
   // label for that row.
   static const bool kTreeViewSelectionPaintsEntireRow;
 
+  // Whether ripples should be used for visual feedback on control activation.
+  static const bool kUseRipples;
+
   // Creates an ImageSkia containing the image to use for the combobox arrow.
   // The |is_enabled| argument is true if the control the arrow is for is
   // enabled, and false if the control is disabled. The |style| argument is the
@@ -85,6 +88,11 @@ class VIEWS_EXPORT PlatformStyle {
   static void ApplyLabelButtonTextStyle(Label* label,
                                         ButtonColorByState* color_by_state);
 
+  // Returns the background color that should be used for an MdTextButton or
+  // other MD controls when in the given state.
+  static SkColor BackgroundColorForMdButton(SkColor color,
+                                            Button::ButtonState state);
+
   // Applies the current system theme to the default border created by |button|.
   static std::unique_ptr<Border> CreateThemedLabelButtonBorder(
       LabelButton* button);