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This CL hooks up the platform decoders to the MediaLog, and populates
certain fields.

Bug: 1139089
Change-Id: Ie5c8e0a9c1ba5eaa91318866952c1b775fd45b16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531133
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826459}