Add image-first-tests flag to run-webkit-tests

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 257 matching lines @@
         self._caller.post('finished_test_list', test_list_name)
 
     def _update_test_input(self, test_input):
         if test_input.reference_files is None:
             # Lazy initialization.
             test_input.reference_files = self._port.reference_files(test_input.test_name)
         if test_input.reference_files:
             test_input.should_run_pixel_test = True
         else:
             test_input.should_run_pixel_test = self._port.should_run_as_pixel_test(test_input)
+        test_input.should_run_pixel_test_first = (
+            self._port.should_run_pixel_test_first(test_input))
 
     def _run_test(self, test_input, shard_name):
         self._batch_count += 1
 
         stop_when_done = False
         if self._batch_size > 0 and self._batch_count >= self._batch_size:
             self._batch_count = 0
             stop_when_done = True
 
         self._update_test_input(test_input)
@@ skipping 212 matching lines @@
         def split_at(seq, index):
             return (seq[:index], seq[index:])
 
         num_old_per_new = divide_and_round_up(len(old_shards), max_new_shards)
         new_shards = []
         remaining_shards = old_shards
         while remaining_shards:
             some_shards, remaining_shards = split_at(remaining_shards, num_old_per_new)
             new_shards.append(TestShard('%s_%d' % (shard_name_prefix, len(new_shards) + 1), extract_and_flatten(some_shards)))
         return new_shards