[swarming/api] Add text in to indicate whether a shard is failing

scripts/slave/recipe_modules/test_utils/test_api.py

 import json
 
 from recipe_engine import recipe_test_api
 
 from .util import GTestResults, TestResults
 
 class TestUtilsTestApi(recipe_test_api.RecipeTestApi):
   @recipe_test_api.placeholder_step_data
   def test_results(self, test_results, retcode=None):
     return self.m.json.output(test_results.as_jsonish(), retcode)
@@ skipping 123 matching lines @@
         jsonish_results['failures'] = tests_run
         jsonish_results['successes'] = []
       jsonish_results['times'] = {t : 0.1 for t in tests_run}
       per_shard_results.append(jsonish_results)
     if swarming:
       jsonish_shards = []
       files_dict = {}
       for i in xrange(shards):
         jsonish_shards.append({
           'failure': not passing,
-          'internal_failure': swarming_internal_failure
+          'internal_failure': swarming_internal_failure,
+          'exit_code': (1 if (not passing or swarming_internal_failure) else 0)
         })
         if i not in missing_shards:
           swarming_path = str(i)
           swarming_path += '\\output.json' if is_win else '/output.json'
           if i not in empty_shards:
             files_dict[swarming_path] = json.dumps(per_shard_results[i])
           else:
             # Simulate a complete harness failure.
             files_dict[swarming_path] = ''
       jsonish_summary = {'shards': jsonish_shards}
       files_dict['summary.json'] = json.dumps(jsonish_summary)
       return self.m.raw_io.output_dir(files_dict)
     else:
       return self.m.json.output(per_shard_results[0])