content: Pass IOSurface references using Mach IPC.

content/common/mac/io_surface_manager_messages.h

+// 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.
+
+#ifndef CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_MESSAGES_H_
+#define CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_MESSAGES_H_
+
+#include <mach/message.h>
+
+#include "content/common/mac/io_surface_manager_token.h"
+
+// Mach messages used for child processes.
+
+// Message IDs.
+// Note: we currently use __LINE__ to give unique IDs to messages.
+// They're unique since all messages are defined in this file.
+#define MACH_MESSAGE_ID() __LINE__
+
+namespace content {
+
+// Messages sent from the child process to the browser.
+
+struct IOSurfaceManagerHostMsg_RegisterIOSurface {
+  enum { ID = MACH_MESSAGE_ID() };
+  mach_msg_header_t header;
+  mach_msg_body_t body;
+  mach_msg_port_descriptor_t io_surface_port;
+  IOSurfaceManagerToken::Name token_name;
+  int io_surface_id;
+  int client_id;
+};
+
+struct IOSurfaceManagerHostMsg_UnregisterIOSurface {
+  enum { ID = MACH_MESSAGE_ID() };
+  mach_msg_header_t header;
+  mach_msg_body_t body;
+  IOSurfaceManagerToken::Name token_name;
+  int io_surface_id;
+  int client_id;
+};
+
+struct IOSurfaceManagerHostMsg_AcquireIOSurface {
+  enum { ID = MACH_MESSAGE_ID() };
+  mach_msg_header_t header;
+  mach_msg_body_t body;
+  IOSurfaceManagerToken::Name token_name;
+  int io_surface_id;
+};
+
+// Messages sent from the browser to the child process.
+
+struct IOSurfaceManagerMsg_RegisterIOSurfaceReply {
+  mach_msg_header_t header;
+  mach_msg_body_t body;
+  boolean_t result;
+};
+
+struct IOSurfaceManagerMsg_AcquireIOSurfaceReply {
+  mach_msg_header_t header;
+  mach_msg_body_t body;
+  mach_msg_port_descriptor_t io_surface_port;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_MESSAGES_H_