First, I need to clean up the edid logic added in audio_AudioBasicHDMI test.
I want to move those code into widget handler so it can be handled behind the scene.

remote:   https://chromium-review.googlesource.com/330480 [autotest] chameleon: Refactor methods related to EDID
remote:   https://chromium-review.googlesource.com/330481 [autotest] audio_widget: Add ChameleonHDMIInputWidgetHandler
remote:   https://chromium-review.googlesource.com/330482 [autotest] Chameleon: Encapsulate EDID and extra plug/unplug to HDMI link
remote:   https://chromium-review.googlesource.com/330570 [autotest] audio_facade: Implement stop_playback
remote:   https://chromium-review.googlesource.com/330571 [autotest] audio_widget: Implement stop_playback on CrosOutputWidgetHandler
remote:   https://chromium-review.googlesource.com/330572 [autotest] audio_test_utils: Add utils to check output node
remote:   https://chromium-review.googlesource.com/330573 [autotest] audio_test_utils: Add utils to switch to HSP
remote:   https://chromium-review.googlesource.com/330574 [autotest] audio_test_utils: return dominant frequency and its coefficient
remote:   https://chromium-review.googlesource.com/330575 [autotest] audio_test_utils: Ignore harmonics in spectral analysis
remote:   https://chromium-review.googlesource.com/330576 [autotest] chameleon_audio_helpers: Let bind_widgets be more flexible
remote:   https://chromium-review.googlesource.com/330577 [autotest] audio_AudioVolume: add volume test for all output devices

This patch series should work. It is really nice to see the same test shared by all output devices.

/tmp/test_that_results_FTv2xn/results-1-audio_AudioVolume.headphone                             [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-1-audio_AudioVolume.headphone/audio_AudioVolume.headphone [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-2-audio_AudioVolume.hdmi                                  [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-2-audio_AudioVolume.hdmi/audio_AudioVolume.hdmi           [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-3-audio_AudioVolume.a2dp                                  [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-3-audio_AudioVolume.a2dp/audio_AudioVolume.a2dp           [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-4-audio_AudioVolume.a2dp                                  [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-4-audio_AudioVolume.a2dp/audio_AudioVolume.a2dp           [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-5-audio_AudioVolume.speaker                               [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-5-audio_AudioVolume.speaker/audio_AudioVolume.speaker     [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-6-audio_AudioVolume.usb                                   [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-6-audio_AudioVolume.usb/audio_AudioVolume.usb             [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-7-audio_AudioVolume.hsp                                   [  PASSED  ]
/tmp/test_that_results_FTv2xn/results-7-audio_AudioVolume.hsp/audio_AudioVolume.hsp             [  PASSED  ]

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9

commit 02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 16:05:10 2016

[autotest] audio_AudioVolume: add volume test for all output devices

Add volume test for all output device. The test logic is shared among
different audio output devices passed in from control file.
The test process includes:
- Set a low volume, play a golden file, record the audio using Chameleon.
- Set a high volume, play a golden file, record the audio using Chameleon.
- Checks the low/high magnitude ratio is lower than a threshold.

The golden file depends on the channels of the audio device to be
tested. Internal speaker and bluetooth HSP use 440Hz sine tone on two
channel, others use 2K and 1K sine tone on two channel.
In each playback/record, the recorded audio needs to match the expected
frequency of that channel of the golden file.

BUG= chromium:591641 
TEST=run e:audio_AudioVolume.* tests on auron_paine at
chromeos1-row5-rack4-host1.

Change-Id: I74c3987288689cfc1ce8bab541c971e6a75a1467
Reviewed-on: https://chromium-review.googlesource.com/330577
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>

[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/audio_AudioVolume.py
[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/control.hsp
[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/control.speaker
[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/control.a2dp
[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/control.headphone
[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/control.usb
[add] https://crrev.com/02a9c105411d7c2d6bbdf96a5edae1e42d62e9b9/server/site_tests/audio_AudioVolume/control.hdmi

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/8a47f4459b0dbac1680ee83c7a4a0303a00ec171

commit 8a47f4459b0dbac1680ee83c7a4a0303a00ec171
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 15:48:11 2016

[autotest] chameleon_audio_helpers: Let bind_widgets be more flexible

Let bind_widgets accept binder as None so it is easier for user to share
test logic among different paths.

BUG= chromium:591641 
TEST=not used yet

Change-Id: I1f865d94be6810178e6cb1ab7d37ca805910eeb2
Reviewed-on: https://chromium-review.googlesource.com/330576
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>

[modify] https://crrev.com/8a47f4459b0dbac1680ee83c7a4a0303a00ec171/client/cros/chameleon/chameleon_audio_helper.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/a8b20b80f1a78e1720af32948c9cb1497bfc850f

commit a8b20b80f1a78e1720af32948c9cb1497bfc850f
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 15:36:19 2016

[autotest] audio_test_utils: Ignore harmonics in spectral analysis

There will be harmonics, that is, multiples of fundamental frequency due
to imperfect sine wave. Ignore those harmonics so the test is more
stable. Otherwise, some harmonics will get higher than second peak ratio
sometimes.

BUG= chromium:591641 
TEST=run audio_AudioBasicInternalSpeaker test

Change-Id: I7ba693ec5b52962077f170a62a06bca1cf09ee97
Reviewed-on: https://chromium-review.googlesource.com/330575
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>

[modify] https://crrev.com/a8b20b80f1a78e1720af32948c9cb1497bfc850f/client/cros/chameleon/audio_test_utils.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/c76df63e6aa2bc434e1e3ccfb4f4e3c0e29a4b35

commit c76df63e6aa2bc434e1e3ccfb4f4e3c0e29a4b35
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 15:04:24 2016

[autotest] audio_test_utils: return dominant frequency and its coefficient

Returns dominant frequency and its coefficient in each channel so user
can use it to measure volume.

BUG= chromium:591641 
TEST=not used yet.

Change-Id: Ie215a6d312c101b8e48f89b53507c90dd975849f
Reviewed-on: https://chromium-review.googlesource.com/330574
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>

[modify] https://crrev.com/c76df63e6aa2bc434e1e3ccfb4f4e3c0e29a4b35/client/cros/chameleon/audio_test_utils.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/402987603ba90733f65cc346a71f17024366d8bd

commit 402987603ba90733f65cc346a71f17024366d8bd
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 12:44:42 2016

[autotest] audio_test_utils: Add utils to switch to HSP

Switch to HSP by selecting bluetooth microphone and start a recording
process on Cros device.

BUG= chromium:591641 
TEST=not used yet.

Change-Id: I418aed2e4c199fb88a4dd647fb8d0c06425f9525
Reviewed-on: https://chromium-review.googlesource.com/330573
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>

[modify] https://crrev.com/402987603ba90733f65cc346a71f17024366d8bd/client/cros/chameleon/audio_test_utils.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/eeadab4a09028539c86328f9d3637eba01628d75

commit eeadab4a09028539c86328f9d3637eba01628d75
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 12:43:06 2016

[autotest] audio_test_utils: Add utils to check output node

Add a utils check_output_port to check output node selected on Cros
device based on port id.

BUG= chromium:591641 
TEST=not used yet.

Change-Id: Id6b8d77576cc8e8e4bed12ed0ded7afec87e8170
Reviewed-on: https://chromium-review.googlesource.com/330572
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>

[modify] https://crrev.com/eeadab4a09028539c86328f9d3637eba01628d75/client/cros/chameleon/audio_test_utils.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/7ef61c3c533fb78c654059880975f11b7f44da27

commit 7ef61c3c533fb78c654059880975f11b7f44da27
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 12:15:20 2016

[autotest] audio_widget: Implement stop_playback on CrosOutputWidgetHandler

Now that audio_facade implements stop_playback, we can use it on
CrosOutputWidgetHandler, and thus user can call stop_playback on output
widget which uses CrosOutputWidgetHandler.
This helps user controls non-blocking playback, which is needed in
volume test because we need to play audio twice in the test.

BUG= chromium:591641 
TEST=not used yet.

Change-Id: I3094378711be84b0b75069cb9cf1e8404e0f7daf
Reviewed-on: https://chromium-review.googlesource.com/330571
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>

[modify] https://crrev.com/7ef61c3c533fb78c654059880975f11b7f44da27/client/cros/chameleon/audio_widget.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/8f199734d555dd90daf766de350c3db2eaa4299e

commit 8f199734d555dd90daf766de350c3db2eaa4299e
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 12:12:46 2016

[autotest] audio_facade: Implement stop_playback

Add a Player class to control playback process. Implement stop_playback
function by terminating the playback process.
Also, cleanup the resources in player and recorder.

BUG= chromium:591641 
TEST=not used yet.

Change-Id: I240329e85aa71c455296cc0de6be07e1cf9fd4ec
Reviewed-on: https://chromium-review.googlesource.com/330570
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>

[modify] https://crrev.com/8f199734d555dd90daf766de350c3db2eaa4299e/server/cros/multimedia/audio_facade_adapter.py
[modify] https://crrev.com/8f199734d555dd90daf766de350c3db2eaa4299e/client/cros/multimedia/audio_facade_native.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/c27db0580a365096813aa03ce3d8b413d5ba1064

commit c27db0580a365096813aa03ce3d8b413d5ba1064
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 02:05:23 2016

[autotest] Chameleon: Encapsulate EDID and extra plug/unplug to HDMI link

Move logic of setting EDID and extra plug/unplug quirk into
HDMIWidgetLink.
Override connect/disconnect methods to set EDID and do extra plug/unplug
in connect. Restores EDID in disconnect.
The connect and disconnect of a link is in widget binder's with clause so EDID
will be restored in the end even if test fails.
This refactoring helps test user to share common test logic among
different audio devices.

BUG= chromium:591641 
TEST=run audio_AudioBasicHDMI test on peach_pit which needs plug/unplug
quirk.

Change-Id: Icd448e028c9fee910da57b7e6106650b76286f95
Reviewed-on: https://chromium-review.googlesource.com/330482
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>

[modify] https://crrev.com/c27db0580a365096813aa03ce3d8b413d5ba1064/client/cros/chameleon/audio_widget_link.py
[modify] https://crrev.com/c27db0580a365096813aa03ce3d8b413d5ba1064/server/site_tests/audio_AudioBasicHDMI/audio_AudioBasicHDMI.py
[modify] https://crrev.com/c27db0580a365096813aa03ce3d8b413d5ba1064/client/cros/chameleon/audio_test_utils.py
[delete] https://crrev.com/fa029e520ff28d6caa761060e1b78d868901d67c/server/site_tests/audio_AudioBasicHDMI/test_data/edids/HDMI_DELL_U2410.txt
[modify] https://crrev.com/c27db0580a365096813aa03ce3d8b413d5ba1064/client/cros/chameleon/chameleon_audio_helper.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/fa029e520ff28d6caa761060e1b78d868901d67c

commit fa029e520ff28d6caa761060e1b78d868901d67c
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 01:55:13 2016

[autotest] audio_widget: Add ChameleonHDMIInputWidgetHandler

Add a class ChameleonHDMIInputWidgetHandler to handle HDMI input on
Chameleon. This widget handler provides methods to set EDID on this port.
It needs access to display_facade so it can find video port and
set/restore EDID through video port.

BUG= chromium:591641 
TEST=Run audi_AudioBasicHDMI test. Methods related to EDID will be used
in the next CL.

Change-Id: Ibaa56d5d207631636115a97d188da8e67a22a624
Reviewed-on: https://chromium-review.googlesource.com/330481
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>

[modify] https://crrev.com/fa029e520ff28d6caa761060e1b78d868901d67c/client/cros/chameleon/audio_widget.py
[modify] https://crrev.com/fa029e520ff28d6caa761060e1b78d868901d67c/client/cros/chameleon/chameleon_audio_helper.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/5d1bce15c62c1bf68ab26a6182fc367de9484215

commit 5d1bce15c62c1bf68ab26a6182fc367de9484215
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Mar 04 01:43:44 2016

[autotest] chameleon: Refactor methods related to EDID

Expose set_edid, set_edid_from_file, and restore_edid methods so user
can take care of restoring EDID in its own with clause.
The current usage of use_edid remains the same.

BUG= chromium:591641 
TEST=run display_StressEdid test

Change-Id: I8943dae48e53dd51d43c2df97fd03ea0ae649c4a
Reviewed-on: https://chromium-review.googlesource.com/330480
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>

[modify] https://crrev.com/5d1bce15c62c1bf68ab26a6182fc367de9484215/client/cros/chameleon/chameleon.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/5bd9c3ac543bfb4c257d6ccae0e851a347705c7d

commit 5bd9c3ac543bfb4c257d6ccae0e851a347705c7d
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Mon Mar 14 01:27:28 2016

autotest-server-tests: Add audio_AudioVolume test

Add audio_AudioVolume test.

BUG= chromium:591641 
TEST=None

Change-Id: Ic182c85355f354b900d1d811aa25756defdfcd7f
Reviewed-on: https://chromium-review.googlesource.com/332550
Commit-Ready: Dan Shi <dshi@google.com>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>

[modify] https://crrev.com/5bd9c3ac543bfb4c257d6ccae0e851a347705c7d/chromeos-base/autotest-server-tests/autotest-server-tests-9999.ebuild