Use vector icon for Ash shelf launcher

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"
 
 namespace ash {
 
 // Max alpha of the shelf background.
 ASH_EXPORT extern const int kShelfBackgroundAlpha;
 
 // Invalid image resource id used for ShelfItemDetails.
 extern const int kInvalidImageResourceID;
 
 const int kInvalidShelfID = 0;
 
 // Size of the shelf when visible (height when the shelf is horizontal).
 ASH_EXPORT extern const int kShelfSize;
 
 // Size of the space between buttons on the shelf.
 ASH_EXPORT extern const int kShelfButtonSpacing;
 
 // Size allocated for each button on the shelf.
 ASH_EXPORT extern const int kShelfButtonSize;
 
 // Animation duration for switching black shelf and dock background on and off.
 ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;
 
+// The color of the icons used in the shelf (launcher, notifications, etc).

[James Cook, 2016/06/07 15:51:52]

nit: foreground color? background color?

[tdanderson, 2016/06/08 17:29:27]

Done.

+ASH_EXPORT extern const SkColor kShelfIconColor;
+
 // The direction of the focus cycling.
 enum CycleDirection { CYCLE_FORWARD, CYCLE_BACKWARD };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_CONSTANTS_H_