arc-app-launcher: Minimal support for ARC app launcher.

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 11 matching lines @@
         'arc/arc_bridge_service_impl.cc',
         'arc/arc_bridge_service_impl.h',
         'arc/common/arc_host_messages.h',
         'arc/common/arc_instance_messages.h',
         'arc/common/arc_message_generator.cc',
         'arc/common/arc_message_generator.h',
         'arc/common/arc_message_traits.h',
         'arc/common/arc_message_types.h',
       ],
     },
+    {
+      # GN version: //components/arc_test_support
+      'target_name': 'arc_test_support',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+        'arc',
+      ],
+      'sources': [
+        'arc/test/fake_arc_bridge_service.cc',
+        'arc/test/fake_arc_bridge_service.h',
+      ],
+    },
   ],
 }