Land Recent QUIC Changes.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index 6fb423a00f2a3df5087db2269d2e2540de142647..6dd8ef3762253da46f46d48447e9595182d56c6d 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -318,6 +318,9 @@ NET_EXPORT_PRIVATE std::string QuicVersionVectorToString(
 //   MakeQuicTag('C', 'H', 'L', 'O');
 NET_EXPORT_PRIVATE QuicTag MakeQuicTag(char a, char b, char c, char d);
 
+// Returns true if the tag vector contains the specified tag.
+bool ContainsQuicTag(QuicTagVector tag_vector, QuicTag tag);
+
 // Size in bytes of the data or fec packet header.
 NET_EXPORT_PRIVATE size_t GetPacketHeaderSize(const QuicPacketHeader& header);