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This cl is to add a red recording dot indicator for the tab that starts
the desktop capture.
This is part of the required UI change for the new getDisplayMaid API.

Bug: 859981
Change-Id: I9e36f6a4c61802152936282ba5f3902db1f774cd
Reviewed-on: https://chromium-review.googlesource.com/1125079
Commit-Queue: Weiyong Yao <braveyao@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573846}