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

appengine/findit/crash/test/findit_for_crash_test.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.blame import Region, Blame
-from common.change_log import ChangeLog
+from gitiles.blame import Region, Blame
+from gitiles.change_log import ChangeLog
+from gitiles.git_repository import GitRepository
 from common.dependency import Dependency, DependencyRoll
-from common.git_repository import GitRepository
 from crash import findit_for_crash
 from crash.callstack import StackFrame, CallStack
 from crash.results import MatchResult
 from crash.stacktrace import Stacktrace
 from crash.test.crash_test_suite import CrashTestSuite
 
 
 DUMMY_CHANGELOG1 = ChangeLog.FromDict({
     'author_name': 'r@chromium.org',
     'message': 'dummy',
@@ skipping 382 matching lines @@
 
       return [match_result1, match_result2]
 
     self.mock(findit_for_crash, 'FindMatchResults', _MockFindMatchResults)
 
     regression_deps_rolls = {'src/': DependencyRoll('src/', 'https://repo',
                                                     '1', '2')}
 
     self.assertEqual(findit_for_crash.FindItForCrash(
         Stacktrace(), regression_deps_rolls, {}, 7), [])