Add mojo interface for audio rendering.

content/browser/renderer_host/media/audio_output_service_impl.h

+// Copyright 2016 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_IMPL_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_IMPL_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "content/common/content_export.h"
+#include "media/mojo/interfaces/audio_output.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace content {
+
+class AudioOutputImpl;
+class AudioOutputServiceContext;
+
+class CONTENT_EXPORT AudioOutputServiceImpl

[o1ka, 2017/01/25 15:15:21]

RenderFrameAudioOutputService?
Let's make names as much self-descriptive as possible.

+    : public media::mojom::AudioOutputService {
+ public:
+  AudioOutputServiceImpl(
+      AudioOutputServiceContext* context,
+      int render_frame_id,
+      base::Callback<void(AudioOutputServiceImpl*)> finished_callback,
+      media::mojom::AudioOutputServiceRequest request);
+
+  ~AudioOutputServiceImpl() override;
+
+  // media::mojom::AudioOutputService implementation.
+  void RequestDeviceAuthorization(
+      int64_t session_id,
+      const std::string& device_id,
+      media::mojom::AudioOutputRequest audio_output,
+      const url::Origin& origin,
+      const RequestDeviceAuthorizationCallback& callback) override;
+
+ private:
+  using AudioOutputVector = std::vector<std::unique_ptr<AudioOutputImpl>>;
+
+  void AuthorizationCompleted(
+      const url::Origin& origin,
+      base::TimeTicks auth_start_time,
+      media::mojom::AudioOutputRequest request,
+      const RequestDeviceAuthorizationCallback& callback,
+      media::OutputDeviceStatus status,
+      bool should_send_id,
+      const media::AudioParameters& params,
+      const std::string& raw_device_id);
+
+  void CloseStream(AudioOutputImpl* audio_output);
+
+  AudioOutputServiceContext* context_;
+  mojo::Binding<media::mojom::AudioOutputService> binding_;
+  AudioOutputVector audio_outputs_;
+  int render_frame_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioOutputServiceImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_IMPL_H_