Kill PageSet.AddPage and its remaining usage

tools/perf/measurements/smoothness_unittest.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.
 import sys
 
 from measurements import smoothness
 from metrics import power
 from telemetry.core import exceptions
 from telemetry.core import wpr_modes
 from telemetry.page import page
@@ skipping 113 matching lines @@
     mean_input_event_latency = results.FindAllPageSpecificValuesNamed(
         'mean_input_event_latency')
     if mean_input_event_latency:
       self.assertEquals(len(mean_input_event_latency), 1)
       self.assertGreater(
           mean_input_event_latency[0].GetRepresentativeNumber(), 0)
 
   @test.Disabled('mac', 'chromeos')  # http://crbug.com/403903
   def testSmoothnessForPageWithNoGesture(self):
     ps = self.CreateEmptyPageSet()
-    ps.AddPage(AnimatedPage(ps))
+    ps.AddUserStory(AnimatedPage(ps))
 
     measurement = smoothness.Smoothness()
     results = self.RunMeasurement(measurement, ps, options=self._options)
     self.assertEquals(0, len(results.failures))
 
     percentage_smooth = results.FindAllPageSpecificValuesNamed(
         'percentage_smooth')
     self.assertEquals(len(percentage_smooth), 1)
     self.assertGreaterEqual(percentage_smooth[0].GetRepresentativeNumber(), 0)
 
@@ skipping 12 matching lines @@
 
     class FakePowerMetric(power.PowerMetric):
       start_called = False
       stop_called = True
       def Start(self, _1, _2):
         self.start_called = True
       def Stop(self, _1, _2):
         self.stop_called = True
 
     ps = self.CreateEmptyPageSet()
-    ps.AddPage(FailPage(ps))
+    ps.AddUserStory(FailPage(ps))
 
     class BuggyMeasurement(smoothness.Smoothness):
       fake_power = None
       # Inject fake power metric.
       def WillStartBrowser(self, platform):
         self.fake_power = self._power_metric = FakePowerMetric(platform)
 
     measurement = BuggyMeasurement()
     try:
       self.RunMeasurement(measurement, ps)
     except exceptions.IntentionalException:
       pass
 
     self.assertTrue(measurement.fake_power.start_called)
     self.assertTrue(measurement.fake_power.stop_called)