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Previously FuchsiaAudioRenderer was expecting timeline update with
stream_delta > 0 after Start(). That doesn't work correctly when
playback is started with playbackRate=0.0 . Presence of
presentation_timeline attribute in AudioConsumerStatus indicates that
playback has started, i.e. Start() call has been handled, so it's not
necessary to check stream_delta > 0.

Bug: 1027048
Change-Id: Ie4de38c34a2ce6cb57faf567b784275b3a2d5a25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976285
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726492}