Early connection migration in QUIC.

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index fa6acb25932232fe5310f8d17000f3369f3340a5..51fd9c88e70a911e9cc29f64bd7432708c177517 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -130,6 +130,7 @@ HttpNetworkSession::Params::Params()
       quic_idle_connection_timeout_seconds(kIdleConnectionTimeoutSeconds),
       quic_disable_preconnect_if_0rtt(false),
       quic_migrate_sessions_on_network_change(false),
+      quic_migrate_sessions_early(false),
       proxy_delegate(NULL),
       enable_token_binding(false) {
   quic_supported_versions.push_back(QUIC_VERSION_25);
@@ -184,6 +185,7 @@ HttpNetworkSession::HttpNetworkSession(const Params& params)
           params.disable_quic_on_timeout_with_open_streams,
           params.quic_idle_connection_timeout_seconds,
           params.quic_migrate_sessions_on_network_change,
+          params.quic_migrate_sessions_early,
           params.quic_connection_options),
       spdy_session_pool_(params.host_resolver,
                          params.ssl_config_service,