Kill PageSet.AddPage and its remaining usage

tools/perf/measurements/smooth_gesture_util_unittest.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 time
 import unittest
 
 from measurements import smooth_gesture_util as sg_util
 from telemetry.core.platform import tracing_category_filter
 from telemetry.core.platform import tracing_options
 from telemetry.page import page as page_module
@@ skipping 96 matching lines @@
     # scroll the page.
     time.sleep(0.5)
     action_runner.ScrollPage()
     time.sleep(0.5)
     interaction.End()
 
 
 class SmoothGestureTest(page_test_test_case.PageTestTestCase):
   def testSmoothGestureAdjusted(self):
     ps = self.CreateEmptyPageSet()
-    ps.AddPage(ScrollingPage(
+    ps.AddUserStory(ScrollingPage(
       'file://scrollable_page.html', ps, base_dir=ps.base_dir))
     models = []
     tab_ids = []
     class ScrollingGestureTestMeasurement(page_test.PageTest):
       def __init__(self):
         # pylint: disable=bad-super-call
         super(ScrollingGestureTestMeasurement, self).__init__(
           'RunSmoothness', False)
 
       def WillRunActions(self, _page, tab):
@@ skipping 22 matching lines @@
     adjusted_smooth_gesture = (
       sg_util.GetAdjustedInteractionIfContainGesture(
         timeline_model, smooth_record))
     # Test that the scroll gesture starts at at least 500ms after the start of
     # the interaction record and ends at at least 500ms before the end of
     # interaction record.
     self.assertLessEqual(
       500, adjusted_smooth_gesture.start - smooth_record.start)
     self.assertLessEqual(
       500, smooth_record.end - adjusted_smooth_gesture.end)