[Predator] Add TouchCrashedDirectory feature.

appengine/findit/crash/chrome_crash_data.py

 # Copyright 2017 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 logging
 from collections import namedtuple
 
 from crash import detect_regression_range
 from crash.crash_data import CrashData
 from crash.chromecrash_parser import ChromeCrashParser
@@ skipping 79 matching lines @@
         all dependencies related to crashed version.
       top_n_frames (int): number of the frames in stacktrace we should parse.
     """
     super(ChromeCrashData, self).__init__(crash_data)
     self._channel = crash_data['customized_data']['channel']
     self._historical_metadata = crash_data['customized_data'][
         'historical_metadata']
 
     # Delay the stacktrace parsing to the first time when stacktrace property
     # gets called.
-    self._stacktrace_str = crash_data['stack_trace'] or ''
     self._top_n_frames = top_n_frames
     self._stacktrace = None
 
     self._dep_fetcher = dep_fetcher
     self._crashed_version_deps = None
 
     self._regression_range = None
 
     self._dependencies = {}
     self._dependency_rolls = {}
@@ skipping 98 matching lines @@
     # Apply the above filter, and also filter to only retain those
     # which occur in ``crashed_stack_deps``.
     self._dependency_rolls = {
         dep_path: dep_roll
         for dep_path, dep_roll in regression_range_dep_rolls.iteritems()
         if HasBothRevisions(dep_path, dep_roll) and dep_path
         in self.dependencies
     }
 
     return self._dependency_rolls