[Findit] Factoring the gitiles (etc) stuff out into its own directory

appengine/findit/waterfall/flake/step_mapper.py

 # Copyright 2016 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.
 
 import json
 import os
 
 import logging
 
-from common import cache_decorator
+from lib.gitiles import cache_decorator
 from common.http_client_appengine import HttpClientAppengine as HttpClient
 from waterfall import buildbot
 from waterfall import swarming_util
 
 
 @cache_decorator.Cached(
     namespace='trybots', cacher=cache_decorator.CompressedMemCacher())
 def _LoadTrybots():  # pragma: no cover.
   """Returns the mapping of Commit Queue trybots to Waterfall buildbots."""
   with open(os.path.join(os.path.dirname(__file__), 'trybots.json'), 'r') as f:
@@ skipping 140 matching lines @@
     output = swarming_util.RetrieveShardedTestResultsFromIsolatedServer(
         step_isolated_data[:1], http_client)
     if output:
       # Guess from the format.
       build_step.supported = (
           isinstance(output, dict) and
           isinstance(output.get('all_tests'), list) and
           isinstance(output.get('per_iteration_data'), list) and
           all(isinstance(i, dict) for i in output.get('per_iteration_data'))
       )