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Partial appends could cause the MP4StreamParser to emit buffers in
non-monotonically increasing timestamp order because of how we process
trun boxes. This patch makes sure that processing of trun boxes is
deferred until we have all the sample & aux_info data before emitting
samples. This prevents the parser from emitting samples in such a way
that will break downstream code. This is a minimal impact fix to
avoid bad behavior at the expense of buffering more data.

BUG=None
TEST=All MP4StreamParserTests that do partial appends now verify the fix.

Review URL: https://codereview.chromium.org/348623003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278650 0039d316-1c4b-4281-b951-d872f2087c98