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

ash/common/system/web_notification/web_notification_tray.cc

Index: ash/common/system/web_notification/web_notification_tray.cc
diff --git a/ash/common/system/web_notification/web_notification_tray.cc b/ash/common/system/web_notification/web_notification_tray.cc
index fd478d7e85cc96dd8841088add0f8886e3ed2b90..66e5ff0546c84ac13bec3e07e062af05e48bf7d3 100644
--- a/ash/common/system/web_notification/web_notification_tray.cc
+++ b/ash/common/system/web_notification/web_notification_tray.cc
@@ -177,9 +177,6 @@ class WebNotificationItem : public views::View, public gfx::AnimationDelegate {
  protected:
   // Overridden from views::View:
   gfx::Size GetPreferredSize() const override {
-    if (!animation_.get() || !animation_->is_animating())

[yoshiki, 2016/08/18 08:39:08]

Please don't remove this. This is a short circuit for the non-animated case.

[yiyix, 2016/08/18 20:01:43]

I am so sorry, i removed it as I tray different solutions to update the
background and as i review my own cl, i missed this change. So sorry.

-      return kTrayItemOuterSize;
-
     // Animate the width (or height) when this item shows (or hides) so that
     // the icons on the left are shifted with the animation.
     // Note that TrayItemView does the same thing.