In QUIC, send data is copied to streams rather than frames. Protected by FLAGS_quic_reloadable_flag…

net/quic/test_tools/simulator/quic_endpoint.cc

Index: net/quic/test_tools/simulator/quic_endpoint.cc
diff --git a/net/quic/test_tools/simulator/quic_endpoint.cc b/net/quic/test_tools/simulator/quic_endpoint.cc
index 6e810d435ed672a743466bc90c8da9d12605418a..f936be88883a3363b78a32a6cb3f01da434dd63d 100644
--- a/net/quic/test_tools/simulator/quic_endpoint.cc
+++ b/net/quic/test_tools/simulator/quic_endpoint.cc
@@ -244,6 +244,21 @@ void QuicEndpoint::WriteStreamData() {
   }
 }
 
+void QuicEndpoint::SaveStreamData(QuicStreamId id,
+                                  QuicIOVector iov,
+                                  size_t iov_offset,
+                                  QuicStreamOffset offset,
+                                  QuicByteCount data_length) {
+  producer_.SaveStreamData(id, iov, iov_offset, offset, data_length);
+}
+
+bool QuicEndpoint::WriteStreamData(QuicStreamId id,
+                                   QuicStreamOffset offset,
+                                   QuicByteCount data_length,
+                                   QuicDataWriter* writer) {
+  return producer_.WriteStreamData(id, offset, data_length, writer);
+}
+
 QuicEndpointMultiplexer::QuicEndpointMultiplexer(
     string name,
     std::initializer_list<QuicEndpoint*> endpoints)