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This CL adds the necessary plumbing to use MediaLog from WebCodecs.

Future CLs will use MediaLogs to improve the logging reported in the
chrome://media-internals tab and the DevTools media tab.

Bug: 1139089
Change-Id: I7730fb388c354a4bdd07d14e9768a39e298e5da7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465583
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819932}