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This CL adds avcOptions, which allows user to choose between H264 stream
formats. By default, the encoded chunks will follow the AVC format, but
users can now choose to chunks converted into "Annex-B".

Bug: 1132050
Change-Id: I38ecfe9d2acec986050cc856a93d49d751152f75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587596
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840927}