Mojo interfaces needed for switching audio rendering stream creation and closing from IPC to Mojo

media/mojo/interfaces/audio_output.mojom

Index: media/mojo/interfaces/audio_output.mojom
diff --git a/media/mojo/interfaces/audio_output.mojom b/media/mojo/interfaces/audio_output.mojom
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+// 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.
+
+module media.mojom;
+
+import "media/mojo/interfaces/media_types.mojom";
+
+// This interface handles audio output stream operations.
+// It allows to close a stream.
+// TODO(rchtara): Add methods that allow the interaction with audio output
+// streams: Play, Pause and SetVolume to this interface.
+// See crbug.com/606707 for more details.
+interface AudioOutputStream {
+  Close();
+};
+
+// This interface manages audio output streams.
+// It allows to create an AudioOutputStream.
+// TODO(rchtara): Add method to request a device authorization to this
+// interface.
+// See crbug.com/606707 for more details.
+interface AudioOutput {
+  CreateStream(
+      int32 stream_id,
+      media.interfaces.AudioParameters params) =>
+      (int32 stream_id,
+       AudioOutputStream? stream,
+       handle<shared_buffer>? shared_buffer,
+       handle? socket_descriptor);
+};