The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc

commit fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc
Author: jennyz <jennyz@chromium.org>
Date: Mon Mar 06 20:14:02 2017

Handle the dual microphones and dual cameras cases. Activate the proper microphone when user activates the front or rear camera on basking devices.

BUG= 698327 
TEST=See the feature spec document in the bug.
TBR=dalecurtis@chromium.org

Review-Url: https://codereview.chromium.org/2721733003
Cr-Commit-Position: refs/heads/master@{#454933}

[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/ash/common/system/chromeos/audio/audio_detailed_view.cc
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/chromeos/BUILD.gn
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/chromeos/audio/audio_device.cc
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/chromeos/audio/audio_device.h
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/chromeos/audio/cras_audio_handler.cc
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/chromeos/audio/cras_audio_handler.h
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/chromeos/audio/cras_audio_handler_unittest.cc
[modify] https://crrev.com/fbaa3e6092a9d8d08a91cd71fdd104dca8df2cfc/media/base/BUILD.gn

Verified on 10032.30.0, 63.0.3239.39.