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To fix the issue of decoder reporting different sample rate
from the demuxer.

some AAC streams' (from NBC Sports/ESPN, etc) ADTS header info,
especially the sample rate, does not match the payload. The
demuxer reports wrong sample rate to mixer, causing incorrect
audio resampling. Currently the decodedbuffer does not include
the sample rate property, so add AudioConfig field to the callback
to return the info back to mixer and adjust the sample rate when
needed. It should apply to all audio paths that needs AudioConfig.

Bug: internal b/112898981
Test: local test NBC sports, audio sounds normal

Depends-On: eureka-internal/199064

Change-Id: Iebef3acf50e856c8fcb47c8d0b13c3598c6df20f
Reviewed-on: https://chromium-review.googlesource.com/1213320
Commit-Queue: Yi Fan <yfa@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589677}