telemetry: Allow page tests to be configured via constructor

tools/perf/measurements/startup.py

 # Copyright 2013 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 metrics import startup_metric
 from telemetry.page import page_test
 
 
 class Startup(page_test.PageTest):
   """Performs a measurement of Chromium's startup performance.
 
   This test must be invoked with either --warm or --cold on the command line. A
   cold start means none of the Chromium files are in the disk cache. A warm
   start assumes the OS has already cached much of Chromium's content. For warm
   tests, you should repeat the page set to ensure it's cached.
   """
 
   def __init__(self, action_name_to_run = ''):
     super(Startup, self).__init__(needs_browser_restart_after_each_page=True,
                                   action_name_to_run=action_name_to_run)
+    self._cold = False
 
-  @classmethod
-  def AddCommandLineArgs(cls, parser):
+  def AddCommandLineArgs(self, parser):
     parser.add_option('--cold', action='store_true',
                       help='Clear the OS disk cache before performing the test')
     parser.add_option('--warm', action='store_true',
                       help='Start up with everything already cached')
 
-  @classmethod
-  def ProcessCommandLineArgs(cls, parser, args):
-    cls._cold = args.cold
+  def ProcessCommandLineArgs(self, parser, args):
+    self._cold = args.cold
     # TODO: Once the bots start running benchmarks, enforce that either --warm
     # or --cold is explicitly specified.
     # if args.warm == args.cold:
     #   parser.error('You must specify either --warm or --cold')
 
   def CustomizeBrowserOptions(self, options):
     if self._cold:
       options.clear_sytem_cache_for_browser_and_profile_on_start = True
     else:
       self.discard_first_result = True
@@ skipping 17 matching lines @@
   cold start means none of the Chromium files are in the disk cache. A warm
   start assumes the OS has already cached much of Chromium's content. For warm
   tests, you should repeat the page set to ensure it's cached.
 
   The startup URL is taken from the page set's startup_url. This
   allows the testing of multiple different URLs in a single benchmark.
   """
 
   def __init__(self):
     super(StartWithUrl, self).__init__(action_name_to_run='RunNavigateSteps')