Fix NTP thumbnail generation

chrome/chrome_tests_unit.gypi

 # Copyright 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': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 227 matching lines @@
       'browser/sync/startup_controller_unittest.cc',
       'browser/sync/sync_startup_tracker_unittest.cc',
       'browser/sync/test/test_http_bridge_factory.cc',
       'browser/sync/test/test_http_bridge_factory.h',
       'browser/sync/test_profile_sync_service.cc',
       'browser/sync/test_profile_sync_service.h',
       'browser/task_profiler/task_profiler_data_serializer_unittest.cc',
       'browser/thumbnails/content_analysis_unittest.cc',
       'browser/thumbnails/content_based_thumbnailing_algorithm_unittest.cc',
       'browser/thumbnails/simple_thumbnail_crop_unittest.cc',
+      'browser/thumbnails/thumbnailing_context_unittest.cc',
       'browser/thumbnails/thumbnail_service_unittest.cc',
       'browser/translate/translate_service_unittest.cc',
       'browser/ui/android/tab_model/tab_model_list_unittest.cc',
       'browser/ui/android/tab_model/tab_model_unittest.cc',
       'browser/ui/autofill/autofill_dialog_models_unittest.cc',
       'browser/ui/autofill/autofill_dialog_types_unittest.cc',
       'browser/ui/autofill/popup_controller_common_unittest.cc',
       'browser/ui/autofill/test_popup_controller_common.cc',
       'browser/ui/autofill/test_popup_controller_common.h',
       'browser/ui/bookmarks/bookmark_editor_unittest.cc',
@@ skipping 2715 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }