Early connection migration in QUIC.

net/http/http_network_session.h

Index: net/http/http_network_session.h
diff --git a/net/http/http_network_session.h b/net/http/http_network_session.h
index f3f336cef81464bd4a64d436430f47035dd74c30..5adff49f9755d8c39208e82420bedb4ac6f96877 100644
--- a/net/http/http_network_session.h
+++ b/net/http/http_network_session.h
@@ -190,9 +190,12 @@ class NET_EXPORT HttpNetworkSession
     bool quic_disable_preconnect_if_0rtt;
     // List of hosts for which QUIC is explicitly whitelisted.
     std::unordered_set<std::string> quic_host_whitelist;
-    // If true, active QUIC sessions may be migrated onto new IPs when network
-    // changes.
+    // If true, active QUIC sessions may be migrated onto a new network when
+    // the platform indicates that the default network is changing.
     bool quic_migrate_sessions_on_network_change;
+    // If true, active QUIC sessions may be migrated onto a new network when
+    // the session experiences poor connectivity.

[Ryan Hamilton, 2016/02/02 04:19:59]

There's a bit of singular/plural confusion here with "active QUIC sessions" vs
"the session".

[Jana, 2016/02/02 06:53:53]

Done.

+    bool quic_migrate_sessions_early;
     ProxyDelegate* proxy_delegate;
     // Enable support for Token Binding.
     bool enable_token_binding;