Add Apache license header to recently added files
diff --git a/strutil_test.cc b/strutil_test.cc
index d014c88..e8e773a 100644
--- a/strutil_test.cc
+++ b/strutil_test.cc
@@ -1,3 +1,17 @@
+// Copyright 2015 Google Inc. All rights reserved
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
#include "strutil.h"
#include <assert.h>