Telemetry: Initialize smoothness and thread_times metrics before page load, not after.

tools/perf/measurements/smoothness_controller.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.
 import sys
 
 from measurements import smooth_gesture_util
 from telemetry.timeline.model import TimelineModel
 from telemetry.page import page_measurement
 from telemetry.page.actions import action_runner
 from telemetry.value import list_of_scalar_values
 from telemetry.value import scalar
 from telemetry.web_perf import timeline_interaction_record as tir_module
 from telemetry.web_perf.metrics import smoothness
 
 
 RUN_SMOOTH_ACTIONS = 'RunSmoothAllActions'
 
 
 class MissingDisplayFrameRateError(page_measurement.MeasurementFailure):
   def __init__(self, name):
     super(MissingDisplayFrameRateError, self).__init__(
       'Missing display frame rate metrics: ' + name)
 
 class SmoothnessController(object):
   def __init__(self):
     self._timeline_model = None
     self._tracing_timeline_data = None
     self._interaction = None
 
-  def Start(self, page, tab):
+  def SetUp(self, page, tab):
     # FIXME: Remove webkit.console when blink.console lands in chromium and
     # the ref builds are updated. crbug.com/386847
     custom_categories = ['webkit.console', 'blink.console', 'benchmark']
     custom_categories += page.GetSyntheticDelayCategories()
     tab.browser.StartTracing(','.join(custom_categories), 60)
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
       tab.browser.platform.StartRawDisplayFrameRateMeasurement()
+
+  def Start(self, tab):
     # Start the smooth marker for all smooth actions.
     runner = action_runner.ActionRunner(tab)
     self._interaction = runner.BeginInteraction(
         RUN_SMOOTH_ACTIONS, is_smooth=True)
 
   def Stop(self, tab):
     # End the smooth marker for all smooth actions.
     self._interaction.End()
     # Stop tracing for smoothness metric.
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
@@ skipping 54 matching lines @@
               results.current_page, r.name, r.unit, r.value))
         else:
           results.AddValue(scalar.ScalarValue(
               results.current_page, r.name, r.unit, r.value))
 
   def CleanUp(self, tab):
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
       tab.browser.platform.StopRawDisplayFrameRateMeasurement()
     if tab.browser.is_tracing_running:
       tab.browser.StopTracing()