Update from https://crrev.com/306655

sandbox/linux/services/syscall_wrappers.h

 // Copyright 2014 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 SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_
 #define SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_
 
 #include <sys/types.h>
 
 #include "sandbox/sandbox_export.h"
 
+struct sock_fprog;
+
 namespace sandbox {
 
 // Provide direct system call wrappers for a few common system calls.
 // These are guaranteed to perform a system call and do not rely on things such
 // as caching the current pid (c.f. getpid()).
 
 SANDBOX_EXPORT pid_t sys_getpid(void);
 
 SANDBOX_EXPORT pid_t sys_gettid(void);
 
 SANDBOX_EXPORT long sys_clone(unsigned long flags);
 
 // |regs| is not supported and must be passed as nullptr.
 SANDBOX_EXPORT long sys_clone(unsigned long flags,
                               void* child_stack,
                               pid_t* ptid,
                               pid_t* ctid,
                               decltype(nullptr) regs);
 
 SANDBOX_EXPORT void sys_exit_group(int status);
 
+// The official system call takes |args| as void*  (in order to be extensible),
+// but add more typing for the cases that are currently used.
+SANDBOX_EXPORT int sys_seccomp(unsigned int operation,
+                               unsigned int flags,
+                               const struct sock_fprog* args);
+
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_