Add RtcpMuxPolicy to PeerConnection.

Source/platform/mediastream/RTCConfiguration.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:
  *
  * 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 59 matching lines @@
     RTCIceTransportsRelay,
     RTCIceTransportsAll
 };
 
 enum RTCBundlePolicy {
     RTCBundlePolicyBalanced,
     RTCBundlePolicyMaxCompat,
     RTCBundlePolicyMaxBundle
 };
 
+enum RTCRtcpMuxPolicy {
+    RTCRtcpMuxPolicyNegotiate,
+    RTCRtcpMuxPolicyRequire
+};
+
 class RTCConfiguration final : public GarbageCollected<RTCConfiguration> {
 public:
     static RTCConfiguration* create() { return new RTCConfiguration(); }
 
     void appendServer(RTCIceServer* server) { m_servers.append(server); }
     size_t numberOfServers() { return m_servers.size(); }
     RTCIceServer* server(size_t index) { return m_servers[index].get(); }
     void setIceTransports(RTCIceTransports iceTransports) { m_iceTransports = iceTransports; }
     RTCIceTransports iceTransports() { return m_iceTransports; }
     void setBundlePolicy(RTCBundlePolicy bundlePolicy) { m_bundlePolicy = bundlePolicy; }
     RTCBundlePolicy bundlePolicy() { return m_bundlePolicy; }
+    void setRtcpMuxPolicy(RTCRtcpMuxPolicy rtcpMuxPolicy) { m_rtcpMuxPolicy = rtcpMuxPolicy; }
+    RTCRtcpMuxPolicy rtcpMuxPolicy() { return m_rtcpMuxPolicy; }
 
     DEFINE_INLINE_TRACE() { visitor->trace(m_servers); }
 
 private:
-    RTCConfiguration() : m_iceTransports(RTCIceTransportsAll), m_bundlePolicy(RTCBundlePolicyBalanced) { }
+    RTCConfiguration() :
+        m_iceTransports(RTCIceTransportsAll),
+        m_bundlePolicy(RTCBundlePolicyBalanced),
+        m_rtcpMuxPolicy(RTCRtcpMuxPolicyNegotiate) { }
 
     HeapVector<Member<RTCIceServer>> m_servers;
     RTCIceTransports m_iceTransports;
     RTCBundlePolicy m_bundlePolicy;
+    RTCRtcpMuxPolicy m_rtcpMuxPolicy;
 };
 
 } // namespace blink
 
 #endif // RTCConfiguration_h