Surface the IntelligibilityEnhancer on MediaConstraints

webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java

Index: webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java
diff --git a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java
index c3ab0438687dafe19b6f679a94b4376c6015b570..70016707fb32361fb1ff9d513e185d62cb10b703 100644
--- a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java
+++ b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java
@@ -194,6 +194,7 @@ class WebRtcAudioEffects {
       canUseNoiseSuppressor = new Boolean(
           isNoiseSuppressorSupported()
           && !WebRtcAudioUtils.useWebRtcBasedNoiseSuppressor()
+          && !WebRtcAudioUtils.useWebRtcBasedIntelligibilityEnhancer()

[the sun, 2016/05/06 09:00:16]

IIUC WebRtcAudioEffects is meant to provide an interface to hardware effects, so
it is not apparent to me that IE needs to be taken into account here when we
don't appear to have hardware support for IE.

henrika@, WDYT ?

[aluebs-webrtc, 2016/05/06 16:27:10]

What this line does is to disable hardware NS when the IE is enabled and use the
software NS instead. This is necessary because it requires the software NS's
background noise estimate, which would be completely suppressed if the hardware
NS is enabled.

           && !isNoiseSuppressorBlacklisted()
           && !isNoiseSuppressorExcludedByUUID());
       Logging.d(TAG, "canUseNoiseSuppressor: " + canUseNoiseSuppressor);