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This CL create a bubble for MediaTray and display
MediaNotificationListView which got from MediaNotificationProviderImpl.

Bug: 1122419
Change-Id: I7cb9a999f6629b63f896e9919e1692a57d168713
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376982Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806321}