Harmony: disable ripples on Mac

ui/views/style/platform_style.cc

Index: ui/views/style/platform_style.cc
diff --git a/ui/views/style/platform_style.cc b/ui/views/style/platform_style.cc
index fe6b9acac5b1ff049aaca5f7cc93a6309f13482c..76932f1fbeb7491654d145ae2bf98f9ab90b6dc7 100644
--- a/ui/views/style/platform_style.cc
+++ b/ui/views/style/platform_style.cc
@@ -43,6 +43,7 @@ const bool PlatformStyle::kTextfieldDragVerticallyDragsToEnd = false;
 const CustomButton::NotifyAction PlatformStyle::kMenuNotifyActivationAction =
     CustomButton::NOTIFY_ON_RELEASE;
 const bool PlatformStyle::kTreeViewSelectionPaintsEntireRow = false;
+const bool PlatformStyle::kUseRipples = true;
 
 // static
 gfx::ImageSkia PlatformStyle::CreateComboboxArrow(bool is_enabled,
@@ -88,6 +89,12 @@ SkColor PlatformStyle::TextColorForButton(
   return color_by_state[button.state()];
 }
 
+SkColor PlatformStyle::BackgroundColorForMdButton(
+    SkColor color,
+    Button::ButtonState state) {
+  return color;
+}
+
 #endif  // OS_MACOSX
 
 #if !defined(DESKTOP_LINUX) && !defined(OS_MACOSX)