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 283f55f3ff3d95f78a5db582d7450380587d896d..2f8001079120bfbac00a7660326657be6fa2b741 100644
--- a/net/quic/core/quic_session.h
+++ b/net/quic/core/quic_session.h
@@ -53,6 +53,9 @@ 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.