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HLS spec recommends a single access unit(AU) in a packetized elementary stream(PES) so that each access unit can
be assigned a unique PTS and DTS. The change makes es_parser_h264 return an error if the AU cannot be assigned a PTS and DTS.

BUG=254214

Review URL: https://codereview.chromium.org/136703005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245347 0039d316-1c4b-4281-b951-d872f2087c98