Fixes a test dependency for building on non-aura snapshot_unittests

ui/snapshot/snapshot.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 29 matching lines @@
           ],
         }],
       ],
     },
     {
       'target_name': 'snapshot_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         '../../skia/skia.gyp:skia',
         '../../base/base.gyp:base',
+        '../../base/base.gyp:test_support_base',
         '../../testing/gtest.gyp:gtest',
         '../ui.gyp:ui',
         'snapshot'
       ],
       'sources': [
         'snapshot_aura_unittest.cc',
         'snapshot_mac_unittest.mm',
         'test/run_all_unittests.cc',
       ],
       'conditions': [
@@ skipping 22 matching lines @@
             'snapshot',
           ],
           'include_dirs': [
             '../..',
           ],
         },
       ],
     }],
   ],
 }