Add mojo interface for audio rendering.

content/browser/renderer_host/media/audio_output_service_context_impl.h

+// Copyright 2017 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_CONTEXT_IMPL_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_CONTEXT_IMPL_H_
+
+// In addition to being an AudioOutputServiceContext, this class also handles
+// requests for mojom::RendererAudioOutputService instances.
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "content/browser/renderer_host/media/audio_output_service_context.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace media {
+class AudioManager;
+}  // namespace media
+
+namespace content {
+
+class MediaStreamManager;
+
+class CONTENT_EXPORT AudioOutputServiceContextImpl
+    : public AudioOutputServiceContext {
+ public:
+  AudioOutputServiceContextImpl(int render_process_id,
+                                media::AudioManager* audio_manager,
+                                MediaStreamManager* media_stream_manager,
+                                const std::string& salt);
+
+  ~AudioOutputServiceContextImpl() override;
+
+  void CreateService(
+      int frame_host_id,
+      mojo::InterfaceRequest<mojom::RendererAudioOutputService> request);
+
+  int GetRenderProcessId() const override;
+
+  void RequestDeviceAuthorization(
+      int render_frame_id,
+      int session_id,
+      const std::string& device_id,
+      const url::Origin& security_origin,
+      AuthorizationCompletedCallback cb) const override;
+
+  const std::string& GetSalt() const override;
+
+  std::unique_ptr<AudioOutputDelegate> CreateDelegate(
+      const std::string& unique_device_id,
+      int render_frame_id,
+      AudioOutputDelegate::EventHandler* handler,
+      const media::AudioParameters& params) override;
+
+  void OnServiceFinished(mojom::RendererAudioOutputService* service) override;
+
+ private:
+  const int render_process_id_;
+  media::AudioManager* const audio_manager_;
+  MediaStreamManager* const media_stream_manager_;
+  const std::string salt_;
+  const AudioOutputAuthorizationHandler authorization_handler_;
+  int next_stream_id_ = 0;
+  std::vector<std::unique_ptr<mojom::RendererAudioOutputService>> services_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_CONTEXT_IMPL_H_