key_mobile_sites_smooth: Reload pages before scrolling for LinkedIn and Wowwiki

tools/perf/measurements/smoothness.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 power
 from measurements import smoothness_controller
 from telemetry.page import page_test
 
 
 class Smoothness(page_test.PageTest):
@@ skipping 26 matching lines @@
 
   def ValidateAndMeasurePage(self, page, tab, results):
     self._power_metric.AddResults(tab, results)
     self._smoothness_controller.AddResults(tab, results)
 
   def CleanUpAfterPage(self, page, tab):
     if self._power_metric:
       self._power_metric.Stop(page, tab)
     if self._smoothness_controller:
       self._smoothness_controller.CleanUp(tab)
+
+
+class SmoothnessDiscardFirstResult(Smoothness):
+  def __init__(self):
+    super(SmoothnessDiscardFirstResult, self).__init__()
+    self._discard_first_result = True