Add json test results format support for SwarmingIsolatedScriptTest

scripts/slave/recipe_modules/swarming/__init__.py

 # Copyright 2014 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.
 
 DEPS = [
   'isolate',
   'recipe_engine/json',
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
   'recipe_engine/python',
   'recipe_engine/raw_io',
   'recipe_engine/step',
   'swarming_client',
   'test_utils',
 ]
 
-from recipe_engine.recipe_api import Property
+try:
+  from recipe_engine.recipe_api import Property
 
-PROPERTIES = {
-  'show_shards_in_collect_step': Property(default=False, kind=bool),
-  'show_isolated_out_in_collect_step': Property(default=True, kind=bool),
-}
+  PROPERTIES = {
+    'show_shards_in_collect_step': Property(default=False, kind=bool),
+    'show_isolated_out_in_collect_step': Property(default=True, kind=bool),
+  }
+# When results_merger_unittest is run, these import will raise exception due
+# to recipe_engine not found. We just handle the ImportError gracefully to
+# let results_merger_unittest runnable.

[Sergiy Byelozyorov, 2016/10/05 15:36:06]

Why does results_merger_unittest need to import this? If the import fails then
it does not actually get anything useful from this module.

[nednguyen, 2016/10/05 18:50:53]

Done. Move results_merger to resources/ help solved this.

+except ImportError:  # pragma: no cover
+  pass