[MIPS] Add seccomp bpf support

build/common.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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2168 matching lines @@
           ['win_z7==0', {
             'fastbuild': 1,
           }],
         ],
       }],
 
       ['OS=="win" and (clang==1 or asan==1)', {
         'chromium_win_pch': 0,
       }],
 
-      # The seccomp-bpf sandbox is only supported on three architectures
+      # The seccomp-bpf sandbox is only supported on four architectures
       # currently.
       # Do not disable seccomp_bpf anywhere without talking to
       # security@chromium.org!
       ['((OS=="linux" or OS=="android") and '
            '(target_arch=="ia32" or target_arch=="x64" or '
-             'target_arch=="arm"))', {
+             'target_arch=="arm" or target_arch=="mipsel"))', {
          'use_seccomp_bpf%': 1,
       }, {
          'use_seccomp_bpf%': 0,
       }],
     ],
 
     # The path to the ANGLE library.
     'angle_path': '<(DEPTH)/third_party/angle',
 
     # List of default apps to install in new profiles.  The first list contains
@@ skipping 3173 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }