Move test-only ContextFactory implementations out of production targets

ui/aura/aura.gyp

 # Copyright (c) 2012 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 115 matching lines @@
           ],
         }],
       ],
     },
     {
       'target_name': 'aura_test_support',
       'type': 'static_library',
       'dependencies': [
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
+        '../compositor/compositor.gyp:compositor_test_support',
         '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
         '../ui.gyp:ui_test_support',
         'aura',
         'aura_test_support_pak',
       ],
       'include_dirs': [
         '..',
       ],
@@ skipping 153 matching lines @@
         ['OS=="linux" and linux_use_tcmalloc==1', {
           'dependencies': [
            # See http://crbug.com/162998#c4 for why this is needed.
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ],
 }