Add promise-based addIceCandidate, setLocalDescription and setRemoteDescription to RTCPeerConnection

third_party/WebKit/Source/modules/mediastream/MediaErrorState.h

 /*
  * Copyright (C) 2015 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 33 matching lines @@
 public:
     MediaErrorState();
     void throwTypeError(const String& message);
     void throwDOMException(const ExceptionCode&, const String& message);
     void throwConstraintError(const String& message, const String& constraint);
     void reset();
 
     bool hadException();
     bool canGenerateException();
     void raiseException(ExceptionState&);
+    String getErrorMessage();
     NavigatorUserMediaError* createError();
 private:
     enum ErrorType {
         NoError,
         TypeError,
         DOMError,
         ConstraintError
     };
     ErrorType m_errorType;
     String m_name;
     ExceptionCode m_code;
     String m_message;
     String m_constraint;
 };
 
 } // namespace blink
 
 #endif // MediaErrorState_h