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

appengine/findit/crash/findit_for_crash.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.
 
 from collections import defaultdict
 
-from common.diff import ChangeType
-from common.git_repository import GitRepository
+from lib.gitiles.diff import ChangeType
+from lib.gitiles.git_repository import GitRepository
 from common.http_client_appengine import HttpClientAppengine
 from crash import crash_util
 from crash.stacktrace import CallStack
 from crash.stacktrace import Stacktrace
 from crash.results import MatchResults
 from crash.scorers.aggregated_scorer import AggregatedScorer
 from crash.scorers.min_distance import MinDistance
 from crash.scorers.top_frame_index import TopFrameIndex
 
 
@@ skipping 225 matching lines @@
   results = filter(lambda r: r.confidence != 0, results)
   if not results:
     return []
 
   sorted_results = sorted(results, key=lambda r: -r.confidence)
 
   if sorted_results[0].confidence > 0.999:
     return sorted_results[:1]
 
   return sorted_results[:3]