arc-bridge: Add IPC message definitions

chromeos/arc/libarcbridge/arc_instance_messages.h

Index: chromeos/arc/libarcbridge/arc_instance_messages.h
diff --git a/chromeos/arc/libarcbridge/arc_instance_messages.h b/chromeos/arc/libarcbridge/arc_instance_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..0b7316cb199c4f704203693121cd871d0c54e094
--- /dev/null
+++ b/chromeos/arc/libarcbridge/arc_instance_messages.h
@@ -0,0 +1,26 @@
+// Copyright 2015 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.
+
+// Messages sent from the ARC instance to the host
+// Multiply-included message file, hence no include guard.
+
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "base/file_descriptor_posix.h"
+#include "ipc/ipc_message_macros.h"
+
+#define IPC_MESSAGE_START ArcInstanceMsgStart
+
+IPC_MESSAGE_CONTROL0(ArcInstanceMsg_Ping)
+
+// Registers a virtual input device on the container side.
+// The virtual device will be reading 'struct input_event's from the
+// file descriptor provided.
+IPC_MESSAGE_CONTROL3(ArcInstanceMsg_RegisterInputDevice,
+                     std::string, /* name */
+                     std::string, /* device_type */
+                     base::FileDescriptor /* fd */)