Added licence boilerplate to our MATLAB files.

webrtc/modules/audio_processing/test/apmtest.m

Index: webrtc/modules/audio_processing/test/apmtest.m
diff --git a/webrtc/modules/audio_processing/test/apmtest.m b/webrtc/modules/audio_processing/test/apmtest.m
index 3172cd156252e54a9499be9f0b5f89052606c07c..1c8183c3ec6fc3770aabc5acadcbd7fd6d1686f3 100644
--- a/webrtc/modules/audio_processing/test/apmtest.m
+++ b/webrtc/modules/audio_processing/test/apmtest.m
@@ -1,3 +1,13 @@
+%
+%  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+%
+%  Use of this source code is governed by a BSD-style license
+%  that can be found in the LICENSE file in the root of the source
+%  tree. An additional intellectual property rights grant can be found
+%  in the file PATENTS.  All contributing project authors may
+%  be found in the AUTHORS file in the root of the source tree.
+%
+
 function apmtest(task, testname, filepath, casenumber, legacy)
 %APMTEST is a tool to process APM file sets and easily display the output.
 %   APMTEST(TASK, TESTNAME, CASENUMBER) performs one of several TASKs: