Server push cancellation: add a finch trial parameter

net/quic/core/quic_session.h

Index: net/quic/core/quic_session.h
diff --git a/net/quic/core/quic_session.h b/net/quic/core/quic_session.h
index cba66a07d6012314aa1139d6150e6b412fe63643..d3f8ddaa5ae667334953c3ae297c734b5e33b5d6 100644
--- a/net/quic/core/quic_session.h
+++ b/net/quic/core/quic_session.h
@@ -52,6 +52,9 @@ class QUIC_EXPORT_PRIVATE QuicSession : public QuicConnectionVisitorInterface {
 
     // Called when the session has become write blocked.
     virtual void OnWriteBlocked(QuicBlockedWriterInterface* blocked_writer) = 0;
+
+    // Called when the session receives reset on a stream from the peer.
+    virtual void OnRstStreamReceived(const QuicRstStreamFrame& frame) = 0;
   };
 
   // CryptoHandshakeEvent enumerates the events generated by a QuicCryptoStream.