[Culprit-Finder] Seperate gae related part in cache_decorator and gitile repository to gae_libs/

appengine/findit/waterfall/flake/step_mapper.py

Index: appengine/findit/waterfall/flake/step_mapper.py
diff --git a/appengine/findit/waterfall/flake/step_mapper.py b/appengine/findit/waterfall/flake/step_mapper.py
index 63c09d7a0cf128327b9f2898236a5b8cebf289f3..a831ee2b16383cb6dca76fbab2601c11f0e80ef9 100644
--- a/appengine/findit/waterfall/flake/step_mapper.py
+++ b/appengine/findit/waterfall/flake/step_mapper.py
@@ -8,13 +8,14 @@ import os
 import logging
 
 from common.http_client_appengine import HttpClientAppengine as HttpClient
+from gae_libs import caches
 from lib import cache_decorator
 from waterfall import buildbot
 from waterfall import swarming_util
 
 
 @cache_decorator.Cached(
-    namespace='trybots', cacher=cache_decorator.CompressedMemCacher())
+    namespace='trybots', cache=caches.CompressedMemCache())
 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:
@@ -167,4 +168,4 @@ def FindMatchingWaterfallStep(build_step):  # pragma: no cover.
           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'))
-      )
+      )