status_logger: record step data

scripts/master/unittests/status_logger_test.py

 #!/usr/bin/env python
 # Copyright (c) 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 contextlib
 import json
 import os
 import tempfile
 import shutil
@@ skipping 31 matching lines @@
 
   def getProperty(self, _name):
     return 1427929423.0
 
   def getProperties(self):
     return Properties()
 
   def getSourceStamp(self):
     return SourceStamp()
 
+  def getSteps(self):
+    return []
+
   def getTimes(self):
     return 5000, 6000
 
 
 class Step(object):
   step_number = 8
   def getName(self):
     return 'reticulating_splines'
 
   def getTimes(self):
@@ skipping 114 matching lines @@
       self.assertTrue(os.path.exists(logger._event_logfile))
       # Ensure we added valid json
       with open(logger._event_logfile, 'r') as f:
         content = f.read()
         self.assertTrue(content)
         json.loads(content)
 
 
 if __name__ == '__main__':
   unittest.main()