Support external audio mixer in webrtc 2.

Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/
The only difference is that
  static MediaEngineInterface* Create(
      webrtc::AudioDeviceModule* adm,
      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
          audio_decoder_factory,
      WebRtcVideoEncoderFactory* video_encoder_factory,
      WebRtcVideoDecoderFactory* video_decoder_factory);
in media/engine/webrtcmediaengine.h is kept in this CL instead of
replaced for backward compatibility.

BUG=webrtc:6457
Committed: https://crrev.com/95aa96465d70167be0670748b2320d5530e5054d
Cr-Commit-Position: refs/heads/master@{#15580}

[GeorgeZ, 2016-12-13 20:15:14]

The CQ bit was checked by gyzhou@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-12-13 20:15:23]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[GeorgeZ, 2016-12-13 20:23:46]

Description was changed from

==========
Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/

BUG=webrtc:6457
==========

to

==========
Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/
The only difference is that
  static MediaEngineInterface* Create(
      webrtc::AudioDeviceModule* adm,
      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
          audio_decoder_factory,
      WebRtcVideoEncoderFactory* video_encoder_factory,
      WebRtcVideoDecoderFactory* video_decoder_factory);
in media/engine/webrtcmediaengine.h is kept in this CL instead of 
replaced for backward compatibility.

BUG=webrtc:6457
==========

[commit-bot: I haz the power, 2016-12-13 20:33:30]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-13 20:33:31]

Dry run: This issue passed the CQ dry run.

[GeorgeZ, 2016-12-13 21:25:50]

gyzhou@chromium.org changed reviewers:
+ solenberg@webrtc.org

[GeorgeZ, 2016-12-13 21:25:51]

Hi Fredrik,

Please take a look of this CL. It passed linux_internal try_bolt. Thanks for
pointing out this try-bolt.

George

[the sun, 2016-12-13 21:56:40]

lgtm

[GeorgeZ, 2016-12-13 22:04:28]

The CQ bit was checked by gyzhou@chromium.org

[commit-bot: I haz the power, 2016-12-13 22:04:30]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-12-13 22:06:27]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481666668627960, "parent_rev":
"46762d0068821343058fe7c5c9f3caf13d778d01", "commit_rev":
"645ab58e165bfc08ae04d59da46bfffdc60538c4"}

[commit-bot: I haz the power, 2016-12-13 22:06:29]

Description was changed from

==========
Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/
The only difference is that
  static MediaEngineInterface* Create(
      webrtc::AudioDeviceModule* adm,
      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
          audio_decoder_factory,
      WebRtcVideoEncoderFactory* video_encoder_factory,
      WebRtcVideoDecoderFactory* video_decoder_factory);
in media/engine/webrtcmediaengine.h is kept in this CL instead of 
replaced for backward compatibility.

BUG=webrtc:6457
==========

to

==========
Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/
The only difference is that
  static MediaEngineInterface* Create(
      webrtc::AudioDeviceModule* adm,
      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
          audio_decoder_factory,
      WebRtcVideoEncoderFactory* video_encoder_factory,
      WebRtcVideoDecoderFactory* video_decoder_factory);
in media/engine/webrtcmediaengine.h is kept in this CL instead of 
replaced for backward compatibility.

BUG=webrtc:6457

Review-Url: https://codereview.webrtc.org/2570993002
==========

[commit-bot: I haz the power, 2016-12-13 22:06:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-13 22:06:43]

Description was changed from

==========
Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/
The only difference is that
  static MediaEngineInterface* Create(
      webrtc::AudioDeviceModule* adm,
      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
          audio_decoder_factory,
      WebRtcVideoEncoderFactory* video_encoder_factory,
      WebRtcVideoDecoderFactory* video_decoder_factory);
in media/engine/webrtcmediaengine.h is kept in this CL instead of 
replaced for backward compatibility.

BUG=webrtc:6457

Review-Url: https://codereview.webrtc.org/2570993002
==========

to

==========
Support external audio mixer in webrtc 2.

An external audio mixer will be passed from PeerConnectionFactory to
AudioTransportProxy.

This CL has rewritten based on reverted CL
https://codereview.chromium.org/2539213003/
The only difference is that
  static MediaEngineInterface* Create(
      webrtc::AudioDeviceModule* adm,
      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
          audio_decoder_factory,
      WebRtcVideoEncoderFactory* video_encoder_factory,
      WebRtcVideoDecoderFactory* video_decoder_factory);
in media/engine/webrtcmediaengine.h is kept in this CL instead of
replaced for backward compatibility.

BUG=webrtc:6457

Committed: https://crrev.com/95aa96465d70167be0670748b2320d5530e5054d
Cr-Commit-Position: refs/heads/master@{#15580}
==========

[commit-bot: I haz the power, 2016-12-13 22:06:43]

Patchset 1 (id:??) landed as
https://crrev.com/95aa96465d70167be0670748b2320d5530e5054d
Cr-Commit-Position: refs/heads/master@{#15580}