telemetry: Allow page tests to be configured via constructor

tools/perf/measurements/thread_times.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 timeline_controller
 from metrics import timeline
 from telemetry.core.platform import tracing_category_filter
 from telemetry.page import page_test
 
 class ThreadTimes(page_test.PageTest):
   def __init__(self):
     super(ThreadTimes, self).__init__('RunSmoothness')
     self._timeline_controller = None
 
-  @classmethod
-  def AddCommandLineArgs(cls, parser):
+  def AddCommandLineArgs(self, parser):
     parser.add_option('--report-silk-details', action='store_true',
                       help='Report details relevant to silk.')
 
   def WillNavigateToPage(self, page, tab):
     self._timeline_controller = timeline_controller.TimelineController()
     if self.options.report_silk_details:
       # We need the other traces in order to have any details to report.
       self._timeline_controller.trace_categories = None
     else:
       self._timeline_controller.trace_categories = \
@@ skipping 10 matching lines @@
     metric = timeline.ThreadTimesTimelineMetric()
     renderer_thread = \
         self._timeline_controller.model.GetRendererThreadFromTabId(tab.id)
     if self.options.report_silk_details:
       metric.details_to_report = timeline.ReportSilkDetails
     metric.AddResults(self._timeline_controller.model, renderer_thread,
                       self._timeline_controller.smooth_records, results)
 
   def CleanUpAfterPage(self, _, tab):
     self._timeline_controller.CleanUp(tab)