[PPAPI][MediaStream] Add browser tests for MediaStreamAudioTrack

ppapi/tests/test_media_stream_audio_track.h

+// Copyright (c) 2014 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 PAPPI_TESTS_TEST_MEDIA_STREAM_AUDIO_TRACK_H_
+#define PAPPI_TESTS_TEST_MEDIA_STREAM_AUDIO_TRACK_H_
+
+#include <string>
+
+#include "ppapi/cpp/media_stream_audio_track.h"
+#include "ppapi/cpp/video_frame.h"
+#include "ppapi/tests/test_case.h"
+
+class TestMediaStreamAudioTrack : public TestCase {
+ public:
+  explicit TestMediaStreamAudioTrack(TestingInstance* instance);
+  virtual ~TestMediaStreamAudioTrack();
+
+ private:
+  // TestCase implementation.
+  virtual bool Init();
+  virtual void RunTests(const std::string& filter);
+
+  // Overrides.
+  virtual void HandleMessage(const pp::Var& message_data);
+
+  std::string TestCreate();
+  std::string TestGetBuffer();
+
+  pp::MediaStreamAudioTrack audio_track_;
+
+  NestedEvent event_;
+};
+
+#endif  // PAPPI_TESTS_TEST_MEDIA_STREAM_AUDIO_TRACK_H_