Migrates QUIC sessions to a new network when old network is (about to be) disconnected.

net/quic/test_tools/quic_test_packet_maker.cc

Index: net/quic/test_tools/quic_test_packet_maker.cc
diff --git a/net/quic/test_tools/quic_test_packet_maker.cc b/net/quic/test_tools/quic_test_packet_maker.cc
index 2119f25157a6648d111eee7d6fdad8fcf95e2791..3133eac6818c74712648957854cc2cad872200ef 100644
--- a/net/quic/test_tools/quic_test_packet_maker.cc
+++ b/net/quic/test_tools/quic_test_packet_maker.cc
@@ -35,6 +35,23 @@ void QuicTestPacketMaker::set_hostname(const std::string& host) {
   host_.assign(host);
 }
 
+scoped_ptr<QuicEncryptedPacket> QuicTestPacketMaker::MakePingPacket(
+    QuicPacketNumber num,
+    bool include_version) {
+  QuicPacketHeader header;
+  header.public_header.connection_id = connection_id_;
+  header.public_header.reset_flag = false;
+  header.public_header.version_flag = include_version;
+  header.public_header.packet_number_length = PACKET_1BYTE_PACKET_NUMBER;
+  header.packet_number = num;
+  header.entropy_flag = false;
+  header.fec_flag = false;
+  header.fec_group = 0;
+
+  QuicPingFrame ping;
+  return scoped_ptr<QuicEncryptedPacket>(MakePacket(header, QuicFrame(ping)));
+}
+
 scoped_ptr<QuicEncryptedPacket> QuicTestPacketMaker::MakeRstPacket(
     QuicPacketNumber num,
     bool include_version,