Enable QUIC v99 flag

Fix a P2PQuic test to correctly grok v99 RST_STREAM semantics.

Change-Id: I7c200aa575926396f814d3d9de3ca460b3723b50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825657Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701579}

net/quic/quic_flags_list.h

@@ -76,7 +76,7 @@ QUIC_FLAG(int32_t, FLAGS_quic_anti_amplification_factor, 3)
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_less_probe_rtt, false)
 
 // If true, enable QUIC v99.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_99, false)
+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_99, true)
 
 // When true, set the initial congestion control window from connection options
 // in QuicSentPacketManager rather than TcpCubicSenderBytes.

third_party/blink/renderer/modules/peerconnection/adapters/p2p_quic_stream_unittest.cc

@@ -174,7 +174,23 @@ TEST_F(P2PQuicStreamTest, StreamClosedAfterReceivingReset) {
 
   quic::QuicRstStreamFrame rst_frame(quic::kInvalidControlFrameId, kStreamId,
                                      quic::QUIC_STREAM_CANCELLED, 0);
+  if (!VersionHasIetfQuicFrames(connection_->version().transport_version)) {
+    // Google RST_STREAM closes the stream in both directions. A RST_STREAM
+    // is then sent to the peer to communicate the final byte offset.
+    EXPECT_CALL(session_,
+                SendRstStream(kStreamId, quic::QUIC_RST_ACKNOWLEDGEMENT, 0));
+  }
   stream_->OnStreamReset(rst_frame);
+  if (VersionHasIetfQuicFrames(connection_->version().transport_version)) {
+    // In IETF QUIC, the RST_STREAM only closes the stream in one direction.
+    // A STOP_SENDING frame in require to induce the a RST_STREAM being
+    // send to close the other direction.
+    EXPECT_CALL(*connection_, SendControlFrame(_));
+    EXPECT_CALL(*connection_, OnStreamReset(kStreamId, testing::_));
+    quic::QuicStopSendingFrame stop_sending_frame(quic::kInvalidControlFrameId,
+                                                  kStreamId, 0);
+    session_.OnStopSendingFrame(stop_sending_frame);
+  }
 
   EXPECT_TRUE(stream_->IsClosedForTesting());
 }