Adds QUIC_VERSION_36 which adds support to force HOL blocking between streams for measurement purpo…

net/quic/crypto/crypto_protocol.h

Index: net/quic/crypto/crypto_protocol.h
diff --git a/net/quic/crypto/crypto_protocol.h b/net/quic/crypto/crypto_protocol.h
index 4c47af09c9d4033c7d660d52b04eeceeb9934587..0b8ddccb8d2203b810c1cf293602118e5a7dc3aa 100644
--- a/net/quic/crypto/crypto_protocol.h
+++ b/net/quic/crypto/crypto_protocol.h
@@ -126,6 +126,8 @@ const QuicTag kBWRS = TAG('B', 'W', 'R', 'S');  // Server bandwidth resumption.
 const QuicTag kMTUH = TAG('M', 'T', 'U', 'H');  // High-target MTU discovery.
 const QuicTag kMTUL = TAG('M', 'T', 'U', 'L');  // Low-target MTU discovery.
 
+const QuicTag kFHOL = TAG('F', 'H', 'O', 'L');   // Force head of line blocking.
+
 // Proof types (i.e. certificate types)
 // NOTE: although it would be silly to do so, specifying both kX509 and kX59R
 // is allowed and is equivalent to specifying only kX509.