Add ArcEnabled policy implementation

components/arc.gypi

 # Copyright 2015 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': [
     {
       # GN version: //components/arc
       'target_name': 'arc',
       'type': 'static_library',
@@ skipping 51 matching lines @@
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         'arc',
         'arc_mojo_bindings',
       ],
       'sources': [
         'arc/test/fake_app_instance.cc',
         'arc/test/fake_app_instance.h',
+        'arc/test/fake_arc_bridge_bootstrap.cc',
+        'arc/test/fake_arc_bridge_bootstrap.h',
         'arc/test/fake_arc_bridge_instance.cc',
         'arc/test/fake_arc_bridge_instance.h',
         'arc/test/fake_arc_bridge_service.cc',
         'arc/test/fake_arc_bridge_service.h',
       ],
     },
     {
       # GN version: //components/arc:mojo_bindings
       'target_name': 'arc_mojo_bindings',
       'type': 'static_library',
@@ skipping 11 matching lines @@
         'arc/common/net.mojom',
         'arc/common/notifications.mojom',
         'arc/common/power.mojom',
         'arc/common/process.mojom',
         'arc/common/settings.mojom',
         'arc/common/video.mojom',
       ],
     },
   ],
 }