Introduces ActivityFactory for SampleActivity.

athena/main/athena_main.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 29 matching lines @@
         '../../skia/skia.gyp:skia',
         '../../ui/accessibility/accessibility.gyp:ax_gen',
         '../../ui/aura/aura.gyp:aura',
         '../../ui/compositor/compositor.gyp:compositor_test_support',
         '../../ui/gfx/gfx.gyp:gfx',
         '../athena.gyp:athena_lib',
         '../athena.gyp:athena_test_support',
       ],
       'sources': [
         'athena_shell.cc',
-        'sample_activity.cc',
-        'sample_activity.h',
       ],
     }
   ],  # targets
 }