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StreamMixer can be configured to use audio post processor. The test
did not set any post processing pipeline for StreamMixer. When the test ran
on a device test failed because a device additionaly processed audio and test got
audio data changed. The test succeeded only when it is run on host (testx86).
The test was fixed to use fake post processor.

Bug: 117792326
Test: Unittests on device.
Change-Id: Ife64df2690504bac249829f98ca659b19d763f23
Reviewed-on: https://chromium-review.googlesource.com/c/1285124
Commit-Queue: Sergei Istomin <sistomin@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600888}