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The AV sync code needs a very accurate idea of the rate of playback of
the audio to function properly. The current APIs get the PTS at the
'current' time, which is vulnerable to thread de-scheduling while the
value is being measured.

Instead, define a new API in the audio pipeline, which atomically returns the
PTS at a timestamp.

Bug: None
Test: Manual
Change-Id: I5c4148066f8293424e7b32f8fd6b5e66ea62e4d0
Reviewed-on: https://chromium-review.googlesource.com/1121591
Commit-Queue: Mina Almasry <almasrymina@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572044}