Pick the DTLS handshake timeout based on the ICE RTT estimate

webrtc/p2p/base/fakeicetransport.h

Index: webrtc/p2p/base/fakeicetransport.h
diff --git a/webrtc/p2p/base/fakeicetransport.h b/webrtc/p2p/base/fakeicetransport.h
index 8daf33b803163e52e6df2cfadf8986cebfab2e4d..9711822588e8c37ff32bf271ed55de0a4e74288e 100644
--- a/webrtc/p2p/base/fakeicetransport.h
+++ b/webrtc/p2p/base/fakeicetransport.h
@@ -151,6 +151,10 @@ class FakeIceTransport : public IceTransportInternal {
     return true;
   }
 
+  rtc::Optional<int> GetRttEstimate() override {
+    return rtc::Optional<int>();
+  }
+
   void SetMetricsObserver(webrtc::MetricsObserverInterface* observer) override {
   }