Re-land 16025005 with fix for statics perf issue

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 "media/midi/midi_port_info.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_END()
+
+// Renderer request to browser for access to MIDI services.
+IPC_MESSAGE_CONTROL2(MIDIHostMsg_RequestAccess,
+                     int /* client id */,
+                     int /* access */)
+
+IPC_MESSAGE_CONTROL3(MIDIHostMsg_SendData,
+                     int /* port */,
+                     std::vector<uint8> /* data */,
+                     double /* timestamp */)
+
+// Messages sent from the browser to the renderer.
+
+IPC_MESSAGE_CONTROL5(MIDIMsg_AccessApproved,
+                     int /* client id */,
+                     int /* access */,
+                     bool /* success */,
+                     media::MIDIPortInfoList /* input ports */,
+                     media::MIDIPortInfoList /* output ports */)
+
+IPC_MESSAGE_CONTROL3(MIDIMsg_DataReceived,
+                     int /* port */,
+                     std::vector<uint8> /* data */,
+                     double /* timestamp */)