Add some statistics to the monsoon profile run

tools/perf/metrics/smoothness.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 metrics import timeline_based_metric
 from metrics import rendering_stats
-from metrics import statistics
 from telemetry.core.timeline import bounds
 from telemetry.page import page_measurement
 from telemetry.page.perf_tests_helper import FlattenList
+from telemetry.util import statistics
 
 
 class NotEnoughFramesError(page_measurement.MeasurementFailure):
   def __init__(self):
     super(NotEnoughFramesError, self).__init__(
         'Page output less than two frames')
 
 
 class NoSupportedActionError(page_measurement.MeasurementFailure):
   def __init__(self):
     super(NoSupportedActionError, self).__init__(
         'None of the actions is supported by smoothness measurement')
 
 class SmoothnessMetric(timeline_based_metric.TimelineBasedMetric):
   def __init__(self):
     super(SmoothnessMetric, self).__init__()
 
   def AddResults(self, model, renderer_thread, interaction_record, results):
     renderer_process = renderer_thread.parent
     time_bounds = bounds.Bounds()
     time_bounds.AddValue(interaction_record.start)
     time_bounds.AddValue(interaction_record.end)
     stats = rendering_stats.RenderingStats(
         renderer_process, model.browser_process, [time_bounds])
     if stats.mouse_wheel_scroll_latency:
       mean_mouse_wheel_scroll_latency = statistics.ArithmeticMean(
-          stats.mouse_wheel_scroll_latency,
-          len(stats.mouse_wheel_scroll_latency))
+          stats.mouse_wheel_scroll_latency)
       mouse_wheel_scroll_latency_discrepancy = statistics.DurationsDiscrepancy(
           stats.mouse_wheel_scroll_latency)
       results.Add('mean_mouse_wheel_scroll_latency', 'ms',
                   round(mean_mouse_wheel_scroll_latency, 3))
       results.Add('mouse_wheel_scroll_latency_discrepancy', '',
                   round(mouse_wheel_scroll_latency_discrepancy, 4))
 
     if stats.touch_scroll_latency:
       mean_touch_scroll_latency = statistics.ArithmeticMean(
-          stats.touch_scroll_latency,
-          len(stats.touch_scroll_latency))
+          stats.touch_scroll_latency)
       touch_scroll_latency_discrepancy = statistics.DurationsDiscrepancy(
           stats.touch_scroll_latency)
       results.Add('mean_touch_scroll_latency', 'ms',
                   round(mean_touch_scroll_latency, 3))
       results.Add('touch_scroll_latency_discrepancy', '',
                   round(touch_scroll_latency_discrepancy, 4))
 
     if stats.js_touch_scroll_latency:
       mean_js_touch_scroll_latency = statistics.ArithmeticMean(
-          stats.js_touch_scroll_latency,
-          len(stats.js_touch_scroll_latency))
+          stats.js_touch_scroll_latency)
       js_touch_scroll_latency_discrepancy = statistics.DurationsDiscrepancy(
           stats.js_touch_scroll_latency)
       results.Add('mean_js_touch_scroll_latency', 'ms',
                   round(mean_js_touch_scroll_latency, 3))
       results.Add('js_touch_scroll_latency_discrepancy', '',
                   round(js_touch_scroll_latency_discrepancy, 4))
 
     # List of raw frame times.
     frame_times = FlattenList(stats.frame_times)
     results.Add('frame_times', 'ms', frame_times)
 
     # Arithmetic mean of frame times.
-    mean_frame_time = statistics.ArithmeticMean(frame_times,
-                                                len(frame_times))
+    mean_frame_time = statistics.ArithmeticMean(frame_times)
     results.Add('mean_frame_time', 'ms', round(mean_frame_time, 3))
 
     # Absolute discrepancy of frame time stamps.
     frame_discrepancy = statistics.TimestampsDiscrepancy(
         stats.frame_timestamps)
     results.Add('jank', 'ms', round(frame_discrepancy, 4))
 
     # Are we hitting 60 fps for 95 percent of all frames?
     # We use 19ms as a somewhat looser threshold, instead of 1000.0/60.0.
     percentile_95 = statistics.Percentile(frame_times, 95.0)
     results.Add('mostly_smooth', 'score', 1.0 if percentile_95 < 19.0 else 0.0)