smoothness.scrolling_tough_ad_cases to use browser driven scrolls

tools/telemetry/telemetry/internal/actions/repeatable_scroll_unittest.py

Index: tools/telemetry/telemetry/internal/actions/repeatable_scroll_unittest.py
diff --git a/tools/telemetry/telemetry/internal/actions/repeatable_scroll_unittest.py b/tools/telemetry/telemetry/internal/actions/repeatable_scroll_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..f5341e9897e1f072e7004c8b5bb832e80bb7a6a0
--- /dev/null
+++ b/tools/telemetry/telemetry/internal/actions/repeatable_scroll_unittest.py
@@ -0,0 +1,64 @@
+# Copyright 2015 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 telemetry.internal.actions import repeatable_scroll
+from telemetry.internal.browser import browser_info as browser_info_module
+from telemetry.testing import tab_test_case
+
+
+class RepeatableScrollActionTest(tab_test_case.TabTestCase):
+
+  def setUp(self):
+    tab_test_case.TabTestCase.setUp(self)
+    self.Navigate('blank.html')
+
+    # Make page bigger than window so it's scrollable.
+    self._tab.ExecuteJavaScript('document.body.style.height = '
+                                ' (3 * window.innerHeight + 1) + "px";')
+
+    self.assertEquals(
+        self._tab.EvaluateJavaScript('document.documentElement.scrollTop '
+                                     '|| document.body.scrollTop'), 0)
+
+    self._browser_info = browser_info_module.BrowserInfo(self._tab.browser)
+    self._window_height = int(
+        self._tab.EvaluateJavaScript('window.innerHeight'))
+
+  def testRepeatableScrollActionNoRepeats(self):
+    if not self._browser_info.HasRepeatableSynthesizeScrollGesture():
+      return
+
+    expected_scroll = (self._window_height / 2) - 1
+
+    i = repeatable_scroll.RepeatableScrollAction(y_scroll_distance_ratio=0.5)
+    i.WillRunAction(self._tab)
+
+    i.RunAction(self._tab)
+
+    scroll_position = self._tab.EvaluateJavaScript(
+        '(document.documentElement.scrollTop || document.body.scrollTop)')
+    # We can only expect the final scroll position to be approximatly equal.
+    self.assertTrue(abs(scroll_position - expected_scroll) < 20,
+                    msg='scroll_position=%d;expected %d' % (scroll_position,
+                                                            expected_scroll))
+
+  def testRepeatableScrollActionTwoRepeats(self):
+    if not self._browser_info.HasRepeatableSynthesizeScrollGesture():
+      return
+
+    expected_scroll = ((self._window_height / 2) - 1) * 3
+
+    i = repeatable_scroll.RepeatableScrollAction(y_scroll_distance_ratio=0.5,
+                                                 repeat_count=2,
+                                                 repeat_delay_ms=1)
+    i.WillRunAction(self._tab)
+
+    i.RunAction(self._tab)
+
+    scroll_position = self._tab.EvaluateJavaScript(
+        '(document.documentElement.scrollTop || document.body.scrollTop)')
+    # We can only expect the final scroll position to be approximatly equal.
+    self.assertTrue(abs(scroll_position - expected_scroll) < 20,
+                    msg='scroll_position=%d;expected %d' % (scroll_position,
+                                                            expected_scroll))