client-only - Change QUIC clients to use the initial RTT estimate that

net/quic/quic_config.cc

Index: net/quic/quic_config.cc
diff --git a/net/quic/quic_config.cc b/net/quic/quic_config.cc
index 4542a04f7477d2e84360a6a6422b84bfcc8d860a..2ab657a3d7e03b92ebcbae23eb21bac17071b0c1 100644
--- a/net/quic/quic_config.cc
+++ b/net/quic/quic_config.cc
@@ -552,6 +552,14 @@ uint32 QuicConfig::ReceivedInitialRoundTripTimeUs() const {
   return initial_round_trip_time_us_.GetReceivedValue();
 }
 
+bool QuicConfig::HasInitialRoundTripTimeUsToSend() const {
+  return initial_round_trip_time_us_.HasSendValue();
+}
+
+uint32 QuicConfig::GetInitialRoundTripTimeUsToSend() const {
+  return initial_round_trip_time_us_.GetSendValue();
+}
+
 void QuicConfig::SetInitialFlowControlWindowToSend(uint32 window_bytes) {
   if (window_bytes < kDefaultFlowControlSendWindow) {
     LOG(DFATAL) << "Initial flow control receive window (" << window_bytes