The function WVMExtractorImpl::getCachedDurationUs returns the cached buffer
size in microseconds, and sets a status to ERROR_END_OF_STREAM at the end of
the movie. The AwesomePlayer will pause if the cache is too small and the
status is not EOS. In bug 6277231, the player would pause just before the EOS
marker would have been seen by the Widevine library.
This change checks the current play time against the total movie duration. If
there is less than 10 seconds left in the movie, the EOS flag is set.
related-to-bug: 6277231
Change-Id: I8dbf60c82c41df485185f85e72452aab0a6a9686