Let Contraints Controll Mute/Unmute Audio Local Playback For Desktop Sharing

third_party/WebKit/public/platform/WebMediaConstraints.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 211 matching lines @@
   DoubleConstraint aspectRatio;
   DoubleConstraint frameRate;
   StringConstraint facingMode;
   DoubleConstraint volume;
   LongConstraint sampleRate;
   LongConstraint sampleSize;
   BooleanConstraint echoCancellation;
   DoubleConstraint latency;
   LongConstraint channelCount;
   StringConstraint deviceId;
+  BooleanConstraint disableLocalEcho;
   StringConstraint groupId;
   // Constraints not exposed in Blink at the moment, only through
   // the legacy name interface.
   StringConstraint mediaStreamSource;  // tab, screen, desktop, system
   BooleanConstraint renderToAssociatedSink;
   BooleanConstraint hotwordEnabled;
   BooleanConstraint googEchoCancellation;
   BooleanConstraint googExperimentalEchoCancellation;
   BooleanConstraint googAutoGainControl;
   BooleanConstraint googExperimentalAutoGainControl;
@@ skipping 69 matching lines @@
 
   BLINK_PLATFORM_EXPORT const WebString toString() const;
 
  private:
   WebPrivatePtr<WebMediaConstraintsPrivate> m_private;
 };
 
 }  // namespace blink
 
 #endif  // WebMediaConstraints_h