Start using APM directly in WVoMC (not VoEAudioProcessing)

- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Update MockAudioProcessing to current APM interface.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690
Committed: https://crrev.com/059fb4480b4bc402c2dd52c04c5028db50802f58
Cr-Commit-Position: refs/heads/master@{#14786}

[the sun, 2016-10-25 20:09:05]

Description was changed from

==========
- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on
APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690
==========

to

==========
- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Update MockAudioProcessing to current APM interface.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on
APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690
==========

[the sun, 2016-10-25 20:09:46]

solenberg@webrtc.org changed reviewers:
+ minyue@webrtc.org, peah@webrtc.org

[the sun, 2016-10-25 20:09:46]

peah@ for the APM mock.
minyue@ for the rest.

[peah-webrtc, 2016-10-26 05:15:50]

On 2016/10/25 20:09:46, the sun wrote:
> peah@ for the APM mock.
> minyue@ for the rest.

Awesome! Thanks for changing this!
lgtm

[minyue-webrtc, 2016-10-26 09:41:56]

LGTM % the title may better not start with a "-"

[the sun, 2016-10-26 11:31:10]

The CQ bit was checked by solenberg@webrtc.org

[commit-bot: I haz the power, 2016-10-26 11:31:17]

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, 2016-10-26 12:12:27]

Description was changed from

==========
- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Update MockAudioProcessing to current APM interface.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on
APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690
==========

to

==========
- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Update MockAudioProcessing to current APM interface.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on
APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690
==========

[commit-bot: I haz the power, 2016-10-26 12:12:28]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2016-10-26 12:12:36]

Description was changed from

==========
- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Update MockAudioProcessing to current APM interface.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on
APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690
==========

to

==========
- Replace FakeAudioProcessing in WVoE unittest with MockAudioProcessing.
- Update MockAudioProcessing to current APM interface.
- Replace calls to VoEAudioProcessing::Start/StopAecDump with direct calls on
APM.
- Add AudioProcessing* in WVoE, get it from VoE, so we can call directly on APM.

BUG=webrtc:4690

Committed: https://crrev.com/059fb4480b4bc402c2dd52c04c5028db50802f58
Cr-Commit-Position: refs/heads/master@{#14786}
==========

[commit-bot: I haz the power, 2016-10-26 12:12:37]

Patchset 4 (id:??) landed as
https://crrev.com/059fb4480b4bc402c2dd52c04c5028db50802f58
Cr-Commit-Position: refs/heads/master@{#14786}