Add CURRENT_TIMESTAMP annotation

scripts/master/chromium_step.py

 # Copyright (c) 2012 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.
 
 """Subclasses of various slave command classes."""
 
 from datetime import datetime
 import copy
 import errno
 import json
@@ skipping 1257 matching lines @@
       # buildset is added, then it is a success. This lambda function returns a
       # tuple, which is received by addAsyncOpToCursor.
       d.addCallback(lambda _: (builder.SUCCESS, None))
       self.addAsyncOpToCursor(
           d,
           'Triggering build(s) on %s' % (', '.join(builder_names),))
       d.addErrback(handle_exception)
     except Exception as ex:
       handle_exception(ex)
 
+  def CURRENT_TIMESTAMP(self, duration):
+    """Does nothing because buildbot master receives logs in real-time."""
+
   @staticmethod
   def getPropertiesForTriggeredBuild(current_properties, new_properties):
     props = {
         'parent_buildername': current_properties.getProperty('buildername'),
         'parent_buildnumber': current_properties.getProperty('buildnumber'),
     }
     props.update(new_properties)
     return props
 
   @defer.inlineCallbacks
@@ skipping 294 matching lines @@
       and starts to wait for remaining steps to finish. Returns command_result
       as Deferred."""
       self.scriptComplete(command_result)
       steps_d = self.script_observer.waitForSteps()
       # Ignore the waitForSteps' result and return the original result,
       # so the caller of runCommand receives command_result.
       steps_d.addCallback(lambda *_: command_result)
       return steps_d
     d.addCallback(onCommandFinished)
     return d