Web MIDI: make MidiManagerMac notify device connections

content/common/media/midi_messages.h

 // Copyright (c) 2013 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.
 
 // IPC messages for access to MIDI hardware.
 // Multiply-included message file, hence no include guard.
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/param_traits_macros.h"
 #include "media/midi/midi_port_info.h"
 #include "media/midi/midi_result.h"
 #include "url/gurl.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 #define IPC_MESSAGE_START MidiMsgStart
 
 IPC_STRUCT_TRAITS_BEGIN(media::MidiPortInfo)
   IPC_STRUCT_TRAITS_MEMBER(id)
   IPC_STRUCT_TRAITS_MEMBER(manufacturer)
   IPC_STRUCT_TRAITS_MEMBER(name)
   IPC_STRUCT_TRAITS_MEMBER(version)
+  IPC_STRUCT_TRAITS_MEMBER(connected)
 IPC_STRUCT_TRAITS_END()
 
 IPC_ENUM_TRAITS_MAX_VALUE(media::MidiResult, media::MIDI_RESULT_LAST)
 
 // Messages for IPC between MidiDispatcher and MidiDispatcherHost.
 
 // Renderer request to browser for using system exclusive messages.
 IPC_MESSAGE_ROUTED3(MidiHostMsg_RequestSysExPermission,
                     int /* client id */,
                     GURL /* origin */,
@@ skipping 18 matching lines @@
 IPC_MESSAGE_CONTROL0(MidiHostMsg_EndSession)
 
 // Messages sent from the browser to the renderer.
 
 IPC_MESSAGE_CONTROL1(MidiMsg_AddInputPort,
                      media::MidiPortInfo /* input port */)
 
 IPC_MESSAGE_CONTROL1(MidiMsg_AddOutputPort,
                      media::MidiPortInfo /* output port */)
 
+IPC_MESSAGE_CONTROL2(MidiMsg_SetInputPortState,
+                     uint32 /* port */,
+                     bool /* connected */)
+
+IPC_MESSAGE_CONTROL2(MidiMsg_SetOutputPortState,
+                     uint32 /* port */,
+                     bool /* connected */)
+
 IPC_MESSAGE_CONTROL1(MidiMsg_SessionStarted,
                      media::MidiResult /* result */)
 
 IPC_MESSAGE_CONTROL3(MidiMsg_DataReceived,
                      uint32 /* port */,
                      std::vector<uint8> /* data */,
                      double /* timestamp */)
 
 IPC_MESSAGE_CONTROL1(MidiMsg_AcknowledgeSentData,
                      uint32 /* bytes sent */)