[Predator] Add Clusterfuzz stacktrace parser.

appengine/findit/crash/test/changelist_classifier_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
 import copy
 
 from common.dependency import Dependency
 from common.dependency import DependencyRoll
 from common import chrome_dependency_fetcher
@@ skipping 100 matching lines @@
 # allowing us to clean up the tests here.
 
 DUMMY_CALLSTACKS = [CallStack(0, [],
                               CallStackFormatType.DEFAULT, LanguageType.CPP),
                     CallStack(1, [],
                               CallStackFormatType.DEFAULT, LanguageType.CPP)]
 DUMMY_REPORT = CrashReport(None, None, None, Stacktrace(DUMMY_CALLSTACKS,
                                                         DUMMY_CALLSTACKS[0]),
                            (None, None))
 
+
 class ChangelistClassifierTest(CrashTestSuite):
 
   def setUp(self):
     super(ChangelistClassifierTest, self).setUp()
     self.changelist_classifier = changelist_classifier.ChangelistClassifier(
         GitilesRepository(self.GetMockHttpClient()), 7)
 
   def testSkipAddedAndDeletedRegressionRolls(self):
     self.mock(chrome_dependency_fetcher.ChromeDependencyFetcher,
               'GetDependency', lambda *_: {})
@@ skipping 351 matching lines @@
       return [suspect1, suspect2]
 
     self.mock(changelist_classifier, 'FindSuspects', _MockFindSuspects)
     self.mock(chrome_dependency_fetcher.ChromeDependencyFetcher,
         'GetDependencyRollsDict',
         lambda *_: {'src/': DependencyRoll('src/', 'https://repo', '1', '2')})
     self.mock(chrome_dependency_fetcher.ChromeDependencyFetcher,
         'GetDependency', lambda *_: {})
 
     self.assertListEqual(self.changelist_classifier(DUMMY_REPORT), [])