GitLab

1. VideoEncodeAcceleratorAdapter calls H264AnnexBToAvcBitstreamConverter
   to convert H264 bitstreams
2. webcodecs::VideoEncoder and media::VideoEncoder have callbacks
   to report decoder config

Bug: 1122955
Change-Id: I897974a04b60cdb2a5c1ce98a9812b6ca9648d80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415221Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809188}