Add a test to assert parsing V2ClientHellos works.

Should have test coverage there as long as we care about supporting it.

Change-Id: Ic67539228b550f2ebd0b543d5a58640913b0474b
Reviewed-on: https://boringssl-review.googlesource.com/1371
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index 7b8d964..1cfdda9 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -383,6 +383,10 @@
 	// SkipNewSessionTicket causes the server to skip sending the
 	// NewSessionTicket message despite promising to in ServerHello.
 	SkipNewSessionTicket bool
+
+	// SendV2ClientHello causes the client to send a V2ClientHello
+	// instead of a normal ClientHello.
+	SendV2ClientHello bool
 }
 
 func (c *Config) serverInit() {