Fix MediaCodec.flush()

There were two problems here. One was that the skip/cut buffer
wasn't cleared when it should be, and the second was that we
were always sending the first buffer of encoded data to the AAC
decoder twice.
b/8543366

Change-Id: Ic040edabf16cccd1f6ef8c9e5c9cfbacbdd8a089
3 files changed