Add mojo interface for audio rendering.

content/browser/renderer_host/media/audio_output_service_context.h

Index: content/browser/renderer_host/media/audio_output_service_context.h
diff --git a/content/browser/renderer_host/media/audio_output_service_context.h b/content/browser/renderer_host/media/audio_output_service_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..88556c108d9a56fd2dc40d7651af11703abea1e0
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+++ b/content/browser/renderer_host/media/audio_output_service_context.h
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+// 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_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_CONTEXT_H_
+
+// AudioOutputServiceContext provides functions common to all
+// AudioOutputService instances for a single renderer process.
+
+#include <memory>
+#include <string>
+
+#include "content/browser/renderer_host/media/audio_output_authorization_handler.h"
+#include "content/browser/renderer_host/media/audio_output_delegate.h"
+#include "content/common/content_export.h"
+
+namespace media {
+class AudioParameters;
+}
+
+namespace content {
+
+namespace mojom {
+class RendererAudioOutputService;
+}  // namespace mojom
+
+class CONTENT_EXPORT AudioOutputServiceContext {
+ public:
+  virtual ~AudioOutputServiceContext() {}
+
+  using AuthorizationCompletedCallback =
+      AudioOutputAuthorizationHandler::AuthorizationCompletedCallback;
+
+  virtual int GetRenderProcessId() const = 0;
+  virtual const std::string& GetSalt() const = 0;
+
+  // Called to request access to a device on behalf of the renderer.
+  virtual void RequestDeviceAuthorization(
+      int render_frame_id,
+      int session_id,
+      const std::string& device_id,
+      const url::Origin& security_origin,
+      AuthorizationCompletedCallback cb) const = 0;
+
+  virtual std::unique_ptr<AudioOutputDelegate> CreateDelegate(
+      const std::string& unique_device_id,
+      int render_frame_id,
+      AudioOutputDelegate::EventHandler* handler,
+      const media::AudioParameters& params) = 0;
+
+  // Should be called by a service when it's done or has encountered an error.
+  virtual void OnServiceFinished(
+      mojom::RendererAudioOutputService* service) = 0;
+};
+
+}  // namespace content
+
+#endif  //  CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_SERVICE_CONTEXT_H_