MediaCodecPlayer implementation - increase preroll precision

During audio preroll we figure out the frame to be played after
the preroll is finished. This CL uses the PTS of this frame
to reset the clock: the base timestamp in the audio decoder
and the interpolator in the player.

We also moved the moment we start interpolating later in time,
to the point we start the actual playback from the preroll.

As a result, the start time has become different from the seek
and preroll time.

Our AAC unit tests swallow the first frame. Now it has been
taken into account and the playback time starts at ~0.23s
with last buffered time approximately equal to the next PTS.

BUG=407577

Review URL: https://codereview.chromium.org/1314023004

Cr-Commit-Position: refs/heads/master@{#346033}

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