Enable generation of local host candidate.

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 77 matching lines @@
 
     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; }
+    bool enableLocalhostCandidate() { return m_enableLocalhostCandidate; }
+    void setEnableLocalhostCandidate(bool enableLocalhostCandidate) { m_enableLocalhostCandidate = enableLocalhostCandidate; }
 
     DEFINE_INLINE_TRACE() { visitor->trace(m_servers); }
 
 private:
     RTCConfiguration() :
         m_iceTransports(RTCIceTransportsAll),
         m_bundlePolicy(RTCBundlePolicyBalanced),
-        m_rtcpMuxPolicy(RTCRtcpMuxPolicyNegotiate) { }
+        m_rtcpMuxPolicy(RTCRtcpMuxPolicyNegotiate),
+        m_enableLocalhostCandidate(false) { }
 
     HeapVector<Member<RTCIceServer>> m_servers;

[juberti, 2015/08/28 00:34:58]

Could this be a pointer instead? Then, if undefined, it could be null.

[guoweis_left_chromium, 2015/08/28 04:53:58]

since we're not going to expose m_servers public, this doesn't remove the need
of having an read accessor enableLocalhostCandidate(). This does bring
complexity into appendServer(), numberOfServers(), server() and inline_trace as
they need to handle the nullptr case. What's the right tradeoff?

     RTCIceTransports m_iceTransports;
     RTCBundlePolicy m_bundlePolicy;
     RTCRtcpMuxPolicy m_rtcpMuxPolicy;
+    bool m_enableLocalhostCandidate;
 };
 
 } // namespace blink
 
 #endif // RTCConfiguration_h