[Chrome OS MD] Draw a 1px separator between 2 tray items

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 39b206075b8f8a254966e0b929b90e0544f33923..1d391f60f08293e66126f04ccac32c39e71b745d 100644
--- a/ash/common/system/tray/tray_constants.h
+++ b/ash/common/system/tray/tray_constants.h
@@ -76,6 +76,12 @@ extern const int kTrayNotificationContentsWidth;
 
 extern const int kMessageCenterBubblePadding;
 
+extern const int kHitRegionPadding;

[James Cook, 2016/08/09 00:25:18]

nit: document this

[yiyix, 2016/08/11 01:23:20]

Done.

+
+// Color and width of a line used to separate tray items in the shelf.
+extern const SkColor kSeparatorColor;
+extern const int kSeparatorWidth;
+
 // The size and foreground color of the icons appearing in the material design
 // system tray.
 extern const int kTrayIconSize;