Surface the IntelligibilityEnhancer on MediaConstraints

webrtc/api/mediaconstraintsinterface.cc

Index: webrtc/api/mediaconstraintsinterface.cc
diff --git a/webrtc/api/mediaconstraintsinterface.cc b/webrtc/api/mediaconstraintsinterface.cc
index a5678701867681f5039f7c0a0280eb3f98e20b18..3b5c5e436c196e1da5fa252bbec495535ff47381 100644
--- a/webrtc/api/mediaconstraintsinterface.cc
+++ b/webrtc/api/mediaconstraintsinterface.cc
@@ -46,6 +46,8 @@ const char MediaConstraintsInterface::kNoiseSuppression[] =
     "googNoiseSuppression";
 const char MediaConstraintsInterface::kExperimentalNoiseSuppression[] =
     "googNoiseSuppression2";
+const char MediaConstraintsInterface::kIntelligibilityEnhancer[] =
+    "IntelligibilityEnhancer";

[tommi, 2016/05/11 06:06:48]

This doesn't follow the convention for audio constraints.
Btw, does this need to be available in Chrome?  If so, talk to hta@ about how to
do that. 

[aluebs-webrtc, 2016/05/11 21:22:05]

By convention do you mean the "goog" prefix? Because I thought we were moving
away from that.
At this point we are only targeting native and I am familiar adding media
constraints to Chrome, but I will contact hta if/when we decide to do so.
Thanks! :)

[tommi, 2016/05/12 07:06:37]

This should be intelligibilityEnhancer

[aluebs-webrtc, 2016/05/13 02:04:38]

You are totally right. Changed.

 const char MediaConstraintsInterface::kHighpassFilter[] =
     "googHighpassFilter";
 const char MediaConstraintsInterface::kTypingNoiseDetection[] =