[Chrome OS MD] Implement accessibility detailed view for the MD Ash system menu

ash/common/system/tray/tray_constants.h

 // Copyright (c) 2012 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_SYSTEM_TRAY_TRAY_CONSTANTS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_
 
 #include "ash/ash_export.h"
 
 typedef unsigned int SkColor;
@@ skipping 79 matching lines @@
 // The size and foreground color of the icons appearing in the material design
 // system tray.
 extern const int kTrayIconSize;
 extern const SkColor kTrayIconColor;
 
 // The size and foreground color of the icons appearing in the material design
 // system menu.
 extern const int kMenuIconSize;
 extern const SkColor kMenuIconColor;
 
+// The margin between the edge of the menu and the edge of the button.
+extern const int kMenuIconMargin;
+
+// The size of buttons in the system menu.
+extern const int kMenuButtonSize;

[tdanderson, 2016/09/21 17:59:32]

kMenuButtonSize was added by another CL, make sure you pull, rebase, and fix
merge conflicts before putting this in the CQ.

[yiyix, 2016/09/21 19:02:26]

Sure, i will rebase the code before send to other people for review. Thank you
for the call out.

+
 enum TrayConstant {
   // A legacy height value used in non-MD calculations for applying additional
   // borders on tray items.
   TRAY_ITEM_HEIGHT_LEGACY,
 
   // Padding between items in the status tray area.
   TRAY_SPACING,
 
   // Padding between the edge of shelf and the item in status tray area.
   TRAY_PADDING_FROM_EDGE_OF_SHELF,
@@ skipping 11 matching lines @@
 int GetTrayConstant(TrayConstant constant);
 
 namespace test {
 const int kSettingsTrayItemViewId = 10000;
 const int kAccessibilityTrayItemViewId = 10001;
 }  // namespace test
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_