Add a continual_gathering_policy in PeerConnection RTCConfiguration

webrtc/p2p/base/dtlstransportchannel.h

Index: webrtc/p2p/base/dtlstransportchannel.h
diff --git a/webrtc/p2p/base/dtlstransportchannel.h b/webrtc/p2p/base/dtlstransportchannel.h
index ea6a579dfbc186e47c9e21859315e1c2553bf0e0..e52ca10d1d7b70737f3e7283a440bc04beb5eca6 100644
--- a/webrtc/p2p/base/dtlstransportchannel.h
+++ b/webrtc/p2p/base/dtlstransportchannel.h
@@ -197,8 +197,8 @@ class DtlsTransportChannelWrapper : public TransportChannelImpl {
     channel_->AddRemoteCandidate(candidate);
   }
 
-  void SetReceivingTimeout(int receiving_timeout_ms) override {
-    channel_->SetReceivingTimeout(receiving_timeout_ms);
+  void SetIceConfig(const IceConfig& config) override {
+    channel_->SetIceConfig(config);
   }
 
   // Needed by DtlsTransport.