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

appengine/findit/crash/callstack.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.
 
 import re
 
 from crash import parse_util
-from crash.type_enums import CallStackFormatType
-from crash.type_enums import CallStackLanguageType
+from crash.type_enums import CallStackFormatType, CallStackLanguageType
 
 # Used to parse a line into StackFrame of a Callstack.
 CALLSTACK_FORMAT_TO_PATTERN = {
     CallStackFormatType.JAVA: re.compile(
         r'at ([A-Za-z0-9$._<>]+)\(\w+(\.java)?:(\d+)\)'),
     CallStackFormatType.SYZYASAN: re.compile(
         r'(CF: )?(.*?)( \(FPO: .*\) )?( \(CONV: .*\) )?\[(.*) @ (\d+)\]'),
     CallStackFormatType.DEFAULT: re.compile(
         r'(.*?):(\d+)(:\d+)?$')
 }
@@ skipping 135 matching lines @@
     # If we have the common stack frame index pattern, then use it
     # since it is more reliable.
     index_match = FRAME_INDEX_PATTERN.match(line)
     if index_match:
       stack_frame_index = int(index_match.group(1))
     else:
       stack_frame_index = len(self)
 
     self.append(StackFrame(stack_frame_index, dep_path, function, file_path,
                            raw_file_path, crashed_line_numbers, repo_url))