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Send in MediaLog to MCVD, and use it to log errors during init
and decoding.

Change-Id: Ia4e0b4689475e5b7fc0cb3bdc1a0ff3a25f6dcf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816133
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699516}