Host-side implementation of ARC audio bridge.

components/arc/common/audio.mojom

+// 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 arc;
+
+// Use same switch values as kernel switch events.
+enum AudioSwitch {

[Luis Héctor Chávez, 2016/03/23 16:22:13]

Do you plan on adding entries to this enum or will it stay as-is forever? If it
is the former, add an [Extensible] tag, otherwise if you add something in the
future, everything will break horribly.

[chinyue, 2016/03/25 09:50:31]

Done.

+  SW_HEADPHONE_INSERT = 0x02,
+  SW_MICROPHONE_INSERT = 0x04
+};
+
+interface AudioHost {
+};
+
+interface AudioInstance {
+  // Establishes full-duplex communication with the host.
+  Init(AudioHost host_ptr);

[elijahtaylor1, 2016/03/23 01:24:55]

if you don't have a meaningful Host interface, you shouldn't need to declare one
and have an Init method.  See process.mojom for an example of an Instance only
interface

[chinyue, 2016/03/25 09:50:31]

Done.

+
+  // Notify plug states of headphone, microphone, etc.  Each switch state is
+  // represented by the corresponding bit, if the bit is set then the switch
+  // is plugged/inserted.
+  NotifySwitchState(uint32 state);
+};