Collecting LatencyInfo in telemetry

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.
 from measurements import smoothness
 from telemetry.core import wpr_modes
 from telemetry.page import page_measurement_unittest_base
 from telemetry.unittest import options_for_unittests
 
 class SmoothnessUnitTest(
       page_measurement_unittest_base.PageMeasurementUnitTestBase):
@@ skipping 22 matching lines @@
     self.assertEquals(len(mean_frame_time), 1)
     self.assertGreater(mean_frame_time[0].GetRepresentativeNumber(), 0)
 
     jank = results.FindAllPageSpecificValuesNamed('jank')
     self.assertEquals(len(jank), 1)
     self.assertGreater(jank[0].GetRepresentativeNumber(), 0)
 
     mostly_smooth = results.FindAllPageSpecificValuesNamed('mostly_smooth')
     self.assertEquals(len(mostly_smooth), 1)
     self.assertGreaterEqual(mostly_smooth[0].GetRepresentativeNumber(), 0)
+
+    mean_mouse_wheel_latency = results.FindAllPageSpecificValuesNamed(
+        'mean_mouse_wheel_latency')
+    if mean_mouse_wheel_latency:
+      self.assertEquals(len(mean_mouse_wheel_latency), 1)
+      self.assertGreater(
+          mean_mouse_wheel_latency[0].GetRepresentativeNumber(), 0)
+
+    mean_touch_scroll_latency = results.FindAllPageSpecificValuesNamed(
+        'mean_touch_scroll_latency')
+    if mean_touch_scroll_latency:
+      self.assertEquals(len(mean_touch_scroll_latency), 1)
+      self.assertGreater(
+          mean_touch_scroll_latency[0].GetRepresentativeNumber(), 0)