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

appengine/findit/waterfall/test/build_failure_analysis_test.py

Index: appengine/findit/waterfall/test/build_failure_analysis_test.py
diff --git a/appengine/findit/waterfall/test/build_failure_analysis_test.py b/appengine/findit/waterfall/test/build_failure_analysis_test.py
index 8fbd51e8e545c923a83b148a34f233bb5db133cb..69a5ba8400970656cfe5fa99af3ffd308bf79f3c 100644
--- a/appengine/findit/waterfall/test/build_failure_analysis_test.py
+++ b/appengine/findit/waterfall/test/build_failure_analysis_test.py
@@ -150,7 +150,7 @@ class BuildFailureAnalysisTest(unittest.TestCase):
         '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):
@@ -239,6 +239,10 @@ class BuildFailureAnalysisTest(unittest.TestCase):
             ],
         },
     }
+    deps_info = {
+      'deps_rolls': {},
+      'current_deps': {},
+    }
     failure_signals_json = {
         'a': {
           'files': {
@@ -293,5 +297,5 @@ class BuildFailureAnalysisTest(unittest.TestCase):
     }
 
     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)