sandbox: extract SetuidSandboxHost code from SetuidSandboxClient

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 76 matching lines @@
     "//base/test:test_support",
     "//testing/gtest",
   ]
 
   if (is_linux) {
     # Don't use this on Android.
     libs = [ "rt" ]
   }
 
   if (compile_suid_client) {
-    sources += [ "suid/client/setuid_sandbox_client_unittest.cc" ]
+    sources += [
+      "suid/client/setuid_sandbox_client_unittest.cc",
+      "suid/client/setuid_sandbox_host_unittest.cc",
+    ]
   }
   if (use_seccomp_bpf) {
     sources += [
       "bpf_dsl/bpf_dsl_more_unittest.cc",
       "bpf_dsl/bpf_dsl_unittest.cc",
       "bpf_dsl/cons_unittest.cc",
       "seccomp-bpf-helpers/baseline_policy_unittest.cc",
       "seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc",
       "seccomp-bpf/bpf_tests_unittest.cc",
       "seccomp-bpf/codegen_unittest.cc",
@@ skipping 191 matching lines @@
   ]
 }
 
 if (compile_suid_client) {
   component("suid_sandbox_client") {
     sources = [
       "suid/common/sandbox.h",
       "suid/common/suid_unsafe_environment_variables.h",
       "suid/client/setuid_sandbox_client.cc",
       "suid/client/setuid_sandbox_client.h",
+      "suid/client/setuid_sandbox_host.cc",
+      "suid/client/setuid_sandbox_host.h",
     ]
     defines = [ "SANDBOX_IMPLEMENTATION" ]
 
     deps = [
       ":sandbox_services",
       "//base",
     ]
   }
 }
 
@@ skipping 22 matching lines @@
   #      'type': 'none',
   #      'variables': {
   #        'test_suite_name': 'sandbox_linux_jni_unittests',
   #      },
   #      'dependencies': [
   #        'sandbox_linux_jni_unittests',
   #      ],
   #      'includes': [ '../../build/apk_test.gypi' ],
   #      }
 }