Update telemetry tests to be agnostic to ScrollTopLeftInterop mode

tools/telemetry/telemetry/internal/actions/action_runner_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 unittest
 
 from telemetry.core import exceptions
 from telemetry import decorators
 from telemetry.internal.actions import page_action
 from telemetry.page import action_runner as action_runner_module
 from telemetry.testing import tab_test_case
@@ skipping 211 matching lines @@
     self.assertTrue(action_runner.EvaluateJavaScript(
         'document.querySelector("#left-right").scrollLeft') > 75)
     action_runner.ScrollElement(
         selector='#top-bottom', direction='down', top_start_ratio=0.9)
     self.assertTrue(action_runner.EvaluateJavaScript(
         'document.querySelector("#top-bottom").scrollTop') > 75)
 
     action_runner.ScrollPage(direction='right', left_start_ratio=0.9,
                              distance=100)
     self.assertTrue(action_runner.EvaluateJavaScript(
-        'document.body.scrollLeft') > 75)
+        'document.scrollingElement.scrollLeft') > 75)
 
   @decorators.Disabled('android',   # crbug.com/437065.
                        'chromeos')  # crbug.com/483212.
   def testSwipe(self):
     if not page_action.IsGestureSourceTypeSupported(
         self._tab, 'touch'):
       return
 
     self.Navigate('page_with_swipeables.html')
     action_runner = action_runner_module.ActionRunner(self._tab,
                                                       skip_waits=True)
 
     action_runner.SwipeElement(
         selector='#left-right', direction='left', left_start_ratio=0.9)
     self.assertTrue(action_runner.EvaluateJavaScript(
         'document.querySelector("#left-right").scrollLeft') > 75)
     action_runner.SwipeElement(
         selector='#top-bottom', direction='up', top_start_ratio=0.9)
     self.assertTrue(action_runner.EvaluateJavaScript(
         'document.querySelector("#top-bottom").scrollTop') > 75)
 
     action_runner.SwipePage(direction='left', left_start_ratio=0.9)
     self.assertTrue(action_runner.EvaluateJavaScript(
-        'document.body.scrollLeft') > 75)
+        'document.scrollingElement.scrollLeft') > 75)
 
 
 class InteractionTest(unittest.TestCase):
 
   def setUp(self):
     self.mock_action_runner = mock.Mock(action_runner_module.ActionRunner)
 
   def testIssuingInteractionRecordCommand(self):
     with action_runner_module.Interaction(
         self.mock_action_runner, label='ABC', flags=[]):
@@ skipping 11 matching lines @@
     with self.assertRaises(FooException):
       with action_runner_module.Interaction(
           self.mock_action_runner, label='ABC', flags=[]):
         raise FooException()
 
     # Test that the end console.timeEnd(...) isn't called because exception was
     # raised.
     expected_calls = [
         mock.call.ExecuteJavaScript('console.time("Interaction.ABC");')]
     self.assertEqual(expected_calls, self.mock_action_runner.mock_calls)