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Currently, when a H264 chunk cannot be converted to a DecodeBuffer, we
return a nullptr. This means that conversion errors are reported as
"null or empty" decoder buffer errors.

This CL fixes the issue by surfacing a media::Status along with the
nullptr.

Bug: 1139089
Change-Id: I018715b56f65b96e843e6af19c9b8300b73b1f9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523750
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826021}