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This CL adds the necessary plumbing to propagate MediaStatus updates
from Java to native code. All the layers between FlingingRenderer and
RemoteMediaPlayerWrapper are associated in a 1:1 capacity. This means
classes don't have to manage collections of observers and can keep
direct references instead.

Bug: 790766
Change-Id: I0e7b2fe061857a07f10149453b86ddb57dba46e5
Reviewed-on: https://chromium-review.googlesource.com/1147678
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583112}