Add MD ink drop ripple to app list button

ash/common/shelf/shelf_constants.cc

Index: ash/common/shelf/shelf_constants.cc
diff --git a/ash/common/shelf/shelf_constants.cc b/ash/common/shelf/shelf_constants.cc
index 04726858c38ba8443169c25d008f04869879db1e..bf7c0361fa5ed836c2406bdc490706a507ff9ece 100644
--- a/ash/common/shelf/shelf_constants.cc
+++ b/ash/common/shelf/shelf_constants.cc
@@ -19,6 +19,7 @@ const int kShelfItemInset = 3;
 const SkColor kShelfBaseColor = SK_ColorBLACK;
 const SkColor kShelfButtonActivatedHighlightColor =
     SkColorSetA(SK_ColorWHITE, 100);
+const SkColor kShelfInkDropBaseColor = SK_ColorWHITE;
 const float kShelfInkDropVisibleOpacity = 0.2f;
 const SkColor kShelfIconColor = SK_ColorWHITE;
 const int kOverflowButtonSize = 32;