[ash-md] Updated layout of Brightness and Audio system menu rows to the material design spec.

ash/common/system/tray/tray_constants.h

Index: ash/common/system/tray/tray_constants.h
diff --git a/ash/common/system/tray/tray_constants.h b/ash/common/system/tray/tray_constants.h
index 6035312a3da9ead13c35aaedddc53187c2d72ac3..9ed2fa9f665e1bd874239177e728810f3eba5d1e 100644
--- a/ash/common/system/tray/tray_constants.h
+++ b/ash/common/system/tray/tray_constants.h
@@ -140,10 +140,11 @@ enum TrayConstant {
   // in the system menu that have a main image (e.g. default and detailed).
   TRAY_POPUP_ITEM_MAIN_IMAGE_CONTAINER_WIDTH,
 
-  // The width used for the 'more' arrow images. In general this applies to all
-  // rows in the system menu that have a 'more' image however most, if not all,
-  // are default rows.
-  TRAY_POPUP_ITEM_MORE_IMAGE_CONTAINER_WIDTH,
+  // The width used for the images used in the 'more' region of default rows.
+  TRAY_POPUP_ITEM_MORE_IMAGE_SIZE,
+
+  // The horizontal inset in the 'more' region of default rows.
+  TRAY_POPUP_ITEM_MORE_REGION_HORIZONTAL_INSET,
 
   // The left inset for all tray system menu rows.
   TRAY_POPUP_ITEM_LEFT_INSET,