Allow QUIC's BBR congestion control to be negotiated in the crypto

net/quic/quic_protocol.cc

Index: net/quic/quic_protocol.cc
diff --git a/net/quic/quic_protocol.cc b/net/quic/quic_protocol.cc
index df3bfa5cc17ad9e2e289d9ce630cc251a4d1e712..7502cdb53d398c7c000cda4d5e8d1c19bbc3c34a 100644
--- a/net/quic/quic_protocol.cc
+++ b/net/quic/quic_protocol.cc
@@ -144,6 +144,11 @@ uint32 MakeQuicTag(char a, char b, char c, char d) {
          static_cast<uint32>(d) << 24;
 }
 
+bool ContainsQuicTag(QuicTagVector tag_vector, QuicTag tag) {
+  return std::find(tag_vector.begin(), tag_vector.end(),  tag)
+      != tag_vector.end();
+}
+
 QuicVersionVector QuicSupportedVersions() {
   QuicVersionVector supported_versions;
   for (size_t i = 0; i < arraysize(kSupportedQuicVersions); ++i) {