Add alternate server address to QuicConfig.

net/quic/quic_config_test.cc

Index: net/quic/quic_config_test.cc
diff --git a/net/quic/quic_config_test.cc b/net/quic/quic_config_test.cc
index b18673e0c5e7d1a76484b700e7d0603b2854cb04..c347b970eceb402873ce2177f168a305c0c5be1e 100644
--- a/net/quic/quic_config_test.cc
+++ b/net/quic/quic_config_test.cc
@@ -112,6 +112,7 @@ TEST_F(QuicConfigTest, ProcessClientHello) {
 }
 
 TEST_F(QuicConfigTest, ProcessServerHello) {
+  const IPEndPoint kTestServerAddress(IPAddress(127, 0, 3, 1), 1234);
   QuicConfig server_config;
   QuicTagVector cgst;
   cgst.push_back(kQBIC);
@@ -126,6 +127,7 @@ TEST_F(QuicConfigTest, ProcessServerHello) {
   server_config.SetInitialSessionFlowControlWindowToSend(
       2 * kInitialSessionFlowControlWindowForTest);
   server_config.SetSocketReceiveBufferToSend(kDefaultSocketReceiveBuffer);
+  server_config.SetAlternateServerAddressToSend(kTestServerAddress);
   CryptoHandshakeMessage msg;
   server_config.ToHandshakeMessage(&msg);
   string error_details;
@@ -143,6 +145,8 @@ TEST_F(QuicConfigTest, ProcessServerHello) {
   EXPECT_EQ(config_.ReceivedInitialSessionFlowControlWindowBytes(),
             2 * kInitialSessionFlowControlWindowForTest);
   EXPECT_EQ(config_.ReceivedSocketReceiveBuffer(), kDefaultSocketReceiveBuffer);
+  EXPECT_TRUE(config_.HasReceivedAlternateServerAddress());
+  EXPECT_EQ(kTestServerAddress, config_.ReceivedAlternateServerAddress());
 }
 
 TEST_F(QuicConfigTest, MissingOptionalValuesInCHLO) {