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tests the equality of the synchronizationSource, timestamp and type
(which is undefined for audio) in addition to frame data equality.

BUG=chromium:1069278

Change-Id: If9d3c3de747b6b9ede71a90477e9a8aec88f0716
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148603Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#759151}