[MIPS] Add seccomp bpf support

sandbox/linux/sandbox_linux.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'conditions': [
       ['OS=="linux"', {
         'compile_suid_client': 1,
         'compile_credentials': 1,
       }, {
         'compile_suid_client': 0,
         'compile_credentials': 0,
       }],
-      ['OS=="linux" and (target_arch=="ia32" or target_arch=="x64")', {
+      ['OS=="linux" and (target_arch=="ia32" or target_arch=="x64" or '
+         'target_arch=="mipsel")', {
         'compile_seccomp_bpf_demo': 1,
       }, {
         'compile_seccomp_bpf_demo': 0,
       }],
     ],
   },
   'target_defaults': {
     'target_conditions': [
       # All linux/ files will automatically be excluded on Android
       # so make sure we re-include them explicitly.
@@ skipping 93 matching lines @@
       'sources': [
         'seccomp-bpf/basicblock.cc',
         'seccomp-bpf/basicblock.h',
         'seccomp-bpf/codegen.cc',
         'seccomp-bpf/codegen.h',
         'seccomp-bpf/die.cc',
         'seccomp-bpf/die.h',
         'seccomp-bpf/errorcode.cc',
         'seccomp-bpf/errorcode.h',
         'seccomp-bpf/instruction.h',
+        'seccomp-bpf/kernel_return_value_helpers.h',
+        'seccomp-bpf/kernel_return_value_helpers.cc',
         'seccomp-bpf/linux_seccomp.h',
         'seccomp-bpf/sandbox_bpf.cc',
         'seccomp-bpf/sandbox_bpf.h',
         'seccomp-bpf/sandbox_bpf_compatibility_policy.h',
         'seccomp-bpf/sandbox_bpf_policy.cc',
         'seccomp-bpf/sandbox_bpf_policy.h',
         'seccomp-bpf/syscall.cc',
         'seccomp-bpf/syscall.h',
         'seccomp-bpf/syscall_iterator.cc',
         'seccomp-bpf/syscall_iterator.h',
@@ skipping 113 matching lines @@
       'include_dirs': [
         '..',
       ],
     },
     { 'target_name': 'sandbox_services_headers',
       'type': 'none',
       'sources': [
         'services/android_arm_ucontext.h',
         'services/android_ucontext.h',
         'services/android_i386_ucontext.h',
+        'services/android_mips_ucontext.h',
         'services/arm_linux_syscalls.h',
+        'services/mips_linux_syscalls.h',
         'services/linux_syscalls.h',
         'services/x86_32_linux_syscalls.h',
         'services/x86_64_linux_syscalls.h',
       ],
       'include_dirs': [
         '..',
       ],
     },
     {
       # We make this its own target so that it does not interfere
@@ skipping 58 matching lines @@
         },
         'dependencies': [
           'sandbox_linux_jni_unittests',
         ],
         'includes': [ '../../build/apk_test.gypi' ],
         }
       ],
     }],
   ],
 }