Add basic ARM support to the seccomp-bpf sandbox.

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.
 
 {
   'targets': [
     # We have two principal targets: sandbox and sandbox_linux_unittests
     # All other targets are listed as dependencies.
     # FIXME(jln): for historial reasons, sandbox_linux is the setuid sandbox
     # and is its own target.
     {
       'target_name': 'sandbox',
       'type': 'none',
       'dependencies': [
         'suid_sandbox_client',
       ],
       'conditions': [
         # Only compile in the seccomp mode 1 code for the flag combination
         # where we support it.
         [ 'OS=="linux" and (target_arch=="ia32" or target_arch=="x64") '
           'and toolkit_views==0 and selinux==0', {
           'dependencies': [
             'linux/seccomp-legacy/seccomp.gyp:seccomp_sandbox',
           ],
         }],
         # Similarly, compile seccomp BPF when we support it
-        [ 'OS=="linux" and (target_arch=="ia32" or target_arch=="x64")', {
+        [ 'OS=="linux" and (target_arch=="ia32" or target_arch=="x64" '
+                           'or target_arch=="arm")', {
           'type': 'static_library',
           'dependencies': [
             'seccomp_bpf',
           ],
         }],
       ],
     },
     {
       'target_name': 'sandbox_linux_unittests',
       'type': 'executable',
@@ skipping 79 matching lines @@
       'dependencies': [
         '../base/base.gyp:base',
       ],
       'include_dirs': [
         '..',
       ],
     },
 
   ],
 }