telemetry: Allow page tests to be configured via constructor

tools/perf/measurements/repaint.py

 # Copyright 2014 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 measurements import smoothness_controller
 from telemetry.page import page_test
 
 
 class Repaint(page_test.PageTest):
   def __init__(self):
     super(Repaint, self).__init__('RunRepaint', False)
     self._smoothness_controller = None
     self._micro_benchmark_id = None
 
-  @classmethod
-  def AddCommandLineArgs(cls, parser):
+  def AddCommandLineArgs(self, parser):
     parser.add_option('--mode', type='string',
                       default='viewport',
                       help='Invalidation mode. '
                       'Supported values: fixed_size, layer, random, viewport.')
     parser.add_option('--width', type='int',
                       default=None,
                       help='Width of invalidations for fixed_size mode.')
     parser.add_option('--height', type='int',
                       default=None,
                       help='Height of invalidations for fixed_size mode.')
@@ skipping 46 matching lines @@
                   "notify_done": true
                 });
     """)
     self._smoothness_controller.Stop(tab)
 
   def ValidateAndMeasurePage(self, page, tab, results):
     self._smoothness_controller.AddResults(tab, results)
 
   def CleanUpAfterPage(self, _, tab):
     self._smoothness_controller.CleanUp(tab)