[Predator] Add TouchCrashedDirectory feature.

appengine/findit/crash/loglinear/changelist_classifier.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
 import logging
 
 from common.chrome_dependency_fetcher import ChromeDependencyFetcher
-from crash.stacktrace import StackInfo
 from crash.suspect import Suspect
 from crash.crash_report import CrashReport
 from crash.loglinear.model import UnnormalizedLogLinearModel
 
 
 class LogLinearChangelistClassifier(object):
   """A ``LogLinearModel``-based implementation of CL classification."""
 
   def __init__(self, get_repository, meta_feature, meta_weight,
                top_n_frames=7, top_n_suspects=3):
@@ skipping 109 matching lines @@
       suspect.confidence = score
       # features is ``MetaFeatureValue`` object containing all feature values.
       features = features_given_report(suspect)
       suspect.reasons = features.reason
       suspect.changed_files = [changed_file.ToDict()
                                for changed_file in features.changed_files]
       scored_suspects.append(suspect)
 
     scored_suspects.sort(key=lambda suspect: -suspect.confidence)
     return scored_suspects[:self._top_n_suspects]