Add maskBytes benchmark.

Author: garyburd

bench_test.go

@@ -0,0 +1,19 @@
+// Copyright 2014 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+	"testing"
+)
+
+func BenchmarkMaskBytes(b *testing.B) {
+	var key [4]byte
+	data := make([]byte, 1024)
+	pos := 0
+	for i := 0; i < b.N; i++ {
+		pos = maskBytes(key, pos, data)
+	}
+	b.SetBytes(int64(len(data)))
+}