Add an initial revision of an audio server.

services/media/audio/platform/generic/throttle_output.h

Index: services/media/audio/platform/generic/throttle_output.h
diff --git a/services/media/audio/platform/generic/throttle_output.h b/services/media/audio/platform/generic/throttle_output.h
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+++ b/services/media/audio/platform/generic/throttle_output.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 SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_THROTTLE_OUTPUT_H_
+#define SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_THROTTLE_OUTPUT_H_
+
+#include "base/callback.h"
+#include "mojo/services/media/common/cpp/local_time.h"
+#include "services/media/audio/platform/generic/standard_output_base.h"
+
+namespace mojo {
+namespace media {
+namespace audio {
+
+class ThrottleOutput : public StandardOutputBase {
+ public:
+  static AudioOutputPtr New(AudioOutputManager* manager);
+  ~ThrottleOutput() override;
+
+ protected:
+  explicit ThrottleOutput(AudioOutputManager* manager);
+
+  // AudioOutput Implementation
+  MediaResult Init() override;
+
+  // StandardOutputBase Implementation
+  bool StartMixJob(MixJob* job, const LocalTime& process_start) override;
+  bool FinishMixJob(const MixJob& job) override;
+
+ private:
+  LocalTime last_sched_time_;
+};
+
+}  // namespace audio
+}  // namespace media
+}  // namespace mojo
+
+#endif  // SERVICES_MEDIA_AUDIO_PLATFORM_GENERIC_THROTTLE_OUTPUT_H_
+