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Whenever there are multiple non-fullscreen badges, a blue dot will show
on the top right corner of the overflow badge if the menu has not been opened
yet. Once it is opened, the blue dot will disappear. The dot reappears if
a new badge is added.

A new BadgeConsumer method markDisplayedBadgeAsRead() is added to allow for the
mediator to tell the view controller when to hide/show the dot.

Screenshot: https://drive.google.com/open?id=13TMm0r1mtm_tz55hiMWkr77R0rMEijPp

Bug: 976901
Change-Id: I220cb865e117b19520c37cea2287757b46803df9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832157
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702047}