Motown: Add examples/media_test, a command line media player app.

examples/media_test/keystroke.h

Index: examples/media_test/keystroke.h
diff --git a/examples/media_test/keystroke.h b/examples/media_test/keystroke.h
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+++ b/examples/media_test/keystroke.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_MEDIA_TEST_KEYSTROKE_H_
+#define EXAMPLES_MEDIA_TEST_KEYSTROKE_H_
+
+namespace examples {
+
+// Returns keystroke or 0 if no key has been pressed. This is non-blocking,
+// but requires the user to hit enter and doesn't suppress echo. Enter alone
+// produces a newline ('\n'). If non-newline characters are entered, the
+// terminating newline is suppressed.
+char Keystroke();
+
+}  // namespace examples
+
+#endif  // EXAMPLES_MEDIA_TEST_KEYSTROKE_H_