[Findit] Add a sub-pipeline to analyze failures caused by DEPS rolls.

appengine/findit/waterfall/test/build_failure_analysis_test.py

 # Copyright 2015 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 unittest
 
 from common.diff import ChangeType
 from waterfall import build_failure_analysis
 from waterfall.failure_signal import FailureSignal
 
@@ skipping 132 matching lines @@
 
     justification = build_failure_analysis._CheckFiles(
         FailureSignal.FromDict(failure_signal_json), change_log_json)
     self.assertIsNone(justification)
 
   def testAnalyzeSuccessfulBuild(self):
     failure_info = {
         'failed': False,
     }
     result = build_failure_analysis.AnalyzeBuildFailure(
-        failure_info, None, None)
+        failure_info, None, None, None)
     self.assertEqual(0, len(result['failures']))
 
   def testAnalyzeBuildFailure(self):
     failure_info = {
         'failed': True,
         'failed_steps': {
             'a': {
                 'current_failure': 99,
                 'first_failure': 98,
             },
@@ skipping 68 matching lines @@
             'revision': 'r96_1',
             'touched_files': [
                 {
                     'change_type': ChangeType.MODIFY,
                     'old_path': 'a/b/f96_1.cc',
                     'new_path': 'a/b/f96_1.cc'
                 },
             ],
         },
     }
+    deps_info = {
+      'deps_rolls': {},
+      'current_deps': {},
+    }
     failure_signals_json = {
         'a': {
           'files': {
               'src/a/b/f99_2.cc': [],
           },
         },
         'b': {
           'files': {
               'x/y/f99_1.cc': [],
           },
@@ skipping 34 matching lines @@
                         'hints': {
                             'added x/y/f99_1.cc (and it was in log)': 5,
                         },
                     }
                 ],
             }
         ]
     }
 
     analysis_result = build_failure_analysis.AnalyzeBuildFailure(
-        failure_info, change_logs, failure_signals_json)
+        failure_info, change_logs, deps_info, failure_signals_json)
     self.assertEqual(expected_analysis_result, analysis_result)