Test the client rejects invalid compression methods from the server.

Change-Id: I90286da596d5822d4cfedf40995d80cf76adaf97
Reviewed-on: https://boringssl-review.googlesource.com/17536
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index b6b4ef2..9e7b204 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -1279,6 +1279,10 @@
 	// send in the ClientHello.
 	SendCompressionMethods []byte
 
+	// SendCompressionMethod is the compression method to send in the
+	// ServerHello.
+	SendCompressionMethod byte
+
 	// AlwaysSendPreSharedKeyIdentityHint, if true, causes the server to
 	// always send a ServerKeyExchange for PSK ciphers, even if the identity
 	// hint is empty.