[Predator] Add TouchCrashedFileMetaFeature.

appengine/findit/crash/suspect.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 namedtuple
 
 from libs.gitiles.commit_util import DistanceBetweenLineRanges
 
 
 # TODO(wrengr): we should change things to use integers with None as
@@ skipping 40 matching lines @@
       raise TypeError(
           'In the ``confidence`` argument to the Result constructor, '
           'expected a number or None, but got a %s object instead.'
           % confidence.__class__.__name__)
     self.changelog = changelog
     self.dep_path = dep_path
     self.confidence = None if confidence is None else float(confidence)
     self.reasons = reasons
     self.changed_files = changed_files
 
+    # TODO(katesonia): These file_to_* should be deprecated once we deprecate
+    # the scorer-based changelist_classifier.
     # TODO(wrengr): (a) make these two fields private/readonly
     # TODO(wrengr): (b) zip them together.
     # TODO(wrengr): (c) move them to the relevant features instead.
     self.file_to_stack_infos = {}
     self.file_to_analysis_info = {}
 
   def ToDict(self):
     return {
         'url': self.changelog.commit_url,
         'review_url': self.changelog.code_review_url,
@@ skipping 104 matching lines @@
       if self._ignore_cls and changelog.revision in self._ignore_cls:
         continue
 
       try:
         suspect = self[changelog.revision]
       except KeyError:
         suspect = Suspect(changelog, dep_path)
         self[changelog.revision] = suspect
 
       suspect._UpdateSuspect(file_path, stack_infos, blame)