test/ add missing license blocks

BUG=chromium:795297

Change-Id: Ic85ff183b2d916547a370fe7894256382aeed1a4
diff --git a/test/noise_model_test.cc b/test/noise_model_test.cc
index 9b7fff8..b5b387e 100644
--- a/test/noise_model_test.cc
+++ b/test/noise_model_test.cc
@@ -1,3 +1,14 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
 #include <math.h>
 #include <algorithm>
 #include <vector>