Test SSL_set_max_send_fragment.

This gives coverage over needing to fragment something over multiple
records.

Change-Id: I2373613608ef669358d48f4e12f68577fa5a40dc
Reviewed-on: https://boringssl-review.googlesource.com/13101
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index 96bc39a..3afd73f 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -1253,6 +1253,10 @@
 	// formats to send in ClientHello or ServerHello. If set to a non-nil
 	// empty slice, no extension will be sent.
 	SendSupportedPointFormats []byte
+
+	// MaxReceivePlaintext, if non-zero, is the maximum plaintext record
+	// length accepted from the peer.
+	MaxReceivePlaintext int
 }
 
 func (c *Config) serverInit() {