Add namespace sandbox class.

sandbox/linux/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//testing/test.gni")
 
 declare_args() {
   compile_suid_client = is_linux
 
@@ skipping 96 matching lines @@
       "seccomp-bpf/codegen_unittest.cc",
       "seccomp-bpf/errorcode_unittest.cc",
       "seccomp-bpf/sandbox_bpf_unittest.cc",
       "seccomp-bpf/syscall_iterator_unittest.cc",
       "seccomp-bpf/syscall_unittest.cc",
     ]
   }
   if (compile_credentials) {
     sources += [
       "services/credentials_unittest.cc",
+      "services/namespace_sandbox_unittest.cc",
       "services/namespace_utils_unittest.cc",
       "services/proc_util_unittest.cc",
       "services/unix_domain_socket_unittest.cc",
     ]
   }
 }
 
 # TODO(GYP) Android version of this test.
 #    {
 #      # This target is the shared library used by Android APK (i.e.
@@ skipping 121 matching lines @@
     "syscall_broker/broker_process.cc",
     "syscall_broker/broker_process.h",
   ]
 
   defines = [ "SANDBOX_IMPLEMENTATION" ]
 
   if (compile_credentials) {
     sources += [
       "services/credentials.cc",
       "services/credentials.h",
+      "services/namespace_sandbox.cc",
+      "services/namespace_sandbox.h",
       "services/namespace_utils.cc",
       "services/namespace_utils.h",
       "services/proc_util.cc",
       "services/proc_util.h",
     ]
 
     # For capabilities.cc.
     configs += [ "//build/config/linux:libcap" ]
   }
 
@@ skipping 70 matching lines @@
   #      'type': 'none',
   #      'variables': {
   #        'test_suite_name': 'sandbox_linux_jni_unittests',
   #      },
   #      'dependencies': [
   #        'sandbox_linux_jni_unittests',
   #      ],
   #      'includes': [ '../../build/apk_test.gypi' ],
   #      }
 }