The solution previously checked in as 2e0e3 is re-introduced here. However,
the MediaCodec-compatible heuristic is not used unless WVM is in Crypto Plugin
(i.e. Media Codec) mode.
To repeat from last time: The problem here is that WVM cannot independently
seek the audio and video read heads, but the API assumes it can. WVM does the
right thing for AwesomePlayer-based playback (essentially ignoring audio
seeks) but the wrong thing for MediaCodec-based playback. For MediaCodec
mode, we should respect the first seek we get for a given destination and
ignore the second.
In this part, the new heuristic is reintroduced, but the old heuristic is
maintained for use in non-Crypto Plugin mode.
Bug: 6793514
Change-Id: I7ced2bf20af117a57eec27490b0920d906a8a684