gfe-relnote: Update QuicConnection's SendMessage to allow specifying if the message
being sent is retransmittable.

PiperOrigin-RevId: 281363715
Change-Id: I81966b19cda8405adb6e6f5d7804c3f042fa4ba8
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index 90369fc..de26b3c 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -758,8 +758,11 @@
   void SetTransmissionType(TransmissionType type);
 
   // Tries to send |message| and returns the message status.
+  // If |flush| is false, this will return a MESSAGE_STATUS_BLOCKED
+  // when the connection is deemed unwritable.
   virtual MessageStatus SendMessage(QuicMessageId message_id,
-                                    QuicMemSliceSpan message);
+                                    QuicMemSliceSpan message,
+                                    bool flush);
 
   // Returns the largest payload that will fit into a single MESSAGE frame.
   // Because overhead can vary during a connection, this method should be