Adding activation logic of the new APM level control functionality using MediaConstraints

webrtc/api/mediaconstraintsinterface.cc

 /*
  *  Copyright 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 30 matching lines @@
 const char MediaConstraintsInterface::kAutoGainControl[] =
     "googAutoGainControl";
 const char MediaConstraintsInterface::kExperimentalAutoGainControl[] =
     "googAutoGainControl2";
 const char MediaConstraintsInterface::kNoiseSuppression[] =
     "googNoiseSuppression";
 const char MediaConstraintsInterface::kExperimentalNoiseSuppression[] =
     "googNoiseSuppression2";
 const char MediaConstraintsInterface::kIntelligibilityEnhancer[] =
     "intelligibilityEnhancer";
+const char MediaConstraintsInterface::kLevelControl[] = "levelControl";
 const char MediaConstraintsInterface::kHighpassFilter[] =
     "googHighpassFilter";
 const char MediaConstraintsInterface::kTypingNoiseDetection[] =
     "googTypingNoiseDetection";
 const char MediaConstraintsInterface::kAudioMirroring[] = "googAudioMirroring";
 
 // Google-specific constraint keys for a local video source (getUserMedia).
 const char MediaConstraintsInterface::kNoiseReduction[] = "googNoiseReduction";
 
 // Constraint keys for CreateOffer / CreateAnswer defined in W3C specification.
@@ skipping 142 matching lines @@
                           &configuration->screencast_min_bitrate);
   ConstraintToOptionalBool(constraints,
                            MediaConstraintsInterface::kCombinedAudioVideoBwe,
                            &configuration->combined_audio_video_bwe);
   ConstraintToOptionalBool(constraints,
                            MediaConstraintsInterface::kEnableDtlsSrtp,
                            &configuration->enable_dtls_srtp);
 }
 
 }  // namespace webrtc