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

appengine/findit/waterfall/identify_try_job_culprit_pipeline.py

 # Copyright 2015 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.
 
 from collections import defaultdict
 import copy
 import logging
 
 from google.appengine.ext import ndb
 
 from common.http_client_appengine import HttpClientAppengine as HttpClient
 from common.pipeline_wrapper import BasePipeline
 from common.waterfall import failure_type
-from lib.gitiles.gitiles_repository import GitilesRepository
+from gae_libs.gitiles.cached_gitiles_repository import CachedGitilesRepository
 from model import analysis_approach_type
 from model import analysis_status
 from model import result_status
 from model.wf_analysis import WfAnalysis
 from model.wf_try_job_data import WfTryJobData
 from model.wf_try_job import WfTryJob
 from waterfall import suspected_cl_util
 from waterfall.send_notification_for_culprit_pipeline import (
     SendNotificationForCulpritPipeline)
 
 
-GIT_REPO = GitilesRepository(
+GIT_REPO = CachedGitilesRepository(
     HttpClient(), 'https://chromium.googlesource.com/chromium/src.git')
 
 
 def _GetResultAnalysisStatus(analysis, result):
   """Returns the analysis status based on existing status and try job result.
 
   Args:
     analysis: The WfAnalysis entity corresponding to this try job.
     result: A result dict containing the result of this try job.
 
@@ skipping 363 matching lines @@
     UpdateWfAnalysisWithTryJobResult()
 
     # TODO (chanli): Update suspected_cl for builds in the same group with
     # current build.
     # Updates suspected_cl.
     UpdateSuspectedCLs()
 
     _NotifyCulprits(master_name, builder_name, build_number, culprits,
                     heuristic_cls, compile_suspected_cl)
     return result.get('culprit') if result else None