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This CL adds a media tray containing a media icon to CrOS status area
next to system tray.

Bug: 1114901

Change-Id: Ic363d925efbf8dac260dc48e950972e30a96283c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347378Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801592}