Add MD ink drop ripple to app list button

ash/common/shelf/shelf_constants.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_COMMON_SHELF_SHELF_CONSTANTS_H_
 #define ASH_COMMON_SHELF_SHELF_CONSTANTS_H_
 
 #include "ash/ash_export.h"
 #include "third_party/skia/include/core/SkColor.h"
 
@@ skipping 39 matching lines @@
 
 // The base color of the shelf to which different alpha values are applied
 // based on the desired shelf opacity level.
 ASH_EXPORT extern const SkColor kShelfBaseColor;
 
 // Highlight color used for shelf button activated states.
 // TODO(bruthig|mohsen): Use of this color is temporary. Draw the active state
 // using the material design ripple animation.
 ASH_EXPORT extern const SkColor kShelfButtonActivatedHighlightColor;
 
+// Ink drop color for shelf items.
+extern const SkColor kShelfInkDropBaseColor;
+
 // The foreground color of the icons used in the shelf (launcher,
 // notifications, etc).
 ASH_EXPORT extern const SkColor kShelfIconColor;
 
 // The direction of the focus cycling.
 enum CycleDirection { CYCLE_FORWARD, CYCLE_BACKWARD };
 
 ASH_EXPORT int GetShelfConstant(ShelfConstant shelf_constant);
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_CONSTANTS_H_