Add new version QUIC_VERSION_29 in which streams honor RST_STREAM + NO_ERROR.

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 aa008c4b8e7c9a102b54c7dcc8d614a92950235a..416628ca7c8c113d662783d43947c72c5755c38b 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -346,6 +346,7 @@ enum QuicVersion {
   QUIC_VERSION_26 = 26,  // In CHLO, send XLCT tag containing hash of leaf cert
   QUIC_VERSION_27 = 27,  // Sends a nonce in the SHLO.
   QUIC_VERSION_28 = 28,  // Receiver can refuse to create a requested stream.
+  QUIC_VERSION_29 = 29,  // Server and client honor QUIC_STREAM_NO_ERROR.
 };
 
 // This vector contains QUIC versions which we currently support.
@@ -356,7 +357,8 @@ enum QuicVersion {
 // IMPORTANT: if you are adding to this list, follow the instructions at
 // http://sites/quic/adding-and-removing-versions
 static const QuicVersion kSupportedQuicVersions[] = {
-    QUIC_VERSION_28, QUIC_VERSION_27, QUIC_VERSION_26, QUIC_VERSION_25};
+    QUIC_VERSION_29, QUIC_VERSION_28, QUIC_VERSION_27, QUIC_VERSION_26,
+    QUIC_VERSION_25};
 
 typedef std::vector<QuicVersion> QuicVersionVector;
 
@@ -418,6 +420,8 @@ GetStartOfEncryptedData(QuicConnectionIdLength connection_id_length,
                         QuicPacketNumberLength packet_number_length);
 
 enum QuicRstStreamErrorCode {
+  // Complete response has been sent, sending a RST to ask the other endpoint
+  // to stop sending request data without discarding the response.
   QUIC_STREAM_NO_ERROR = 0,
 
   // There was some error which halted stream processing.