cc: Remove unused metrics from RenderingStats.

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.
 
 import os
 
 from metrics import statistics
 from telemetry.core import util
 from telemetry.page import page_measurement
 
@@ skipping 77 matching lines @@
       'window.chrome.loadTimes().firstPaintTime - ' +
       'window.chrome.loadTimes().startLoadTime')
 
   results.Add('first_paint', 'ms', round(first_paint_secs * 1000, 1))
 
 
 def CalcResults(benchmark_stats, results):
   s = benchmark_stats
 
   frame_times = []
-  for i in xrange(1, len(s.screen_frame_timestamps)):
+  for i in xrange(1, len(s.frame_timestamps)):
     frame_times.append(
-        round(s.screen_frame_timestamps[i] - s.screen_frame_timestamps[i-1], 2))
+        round(s.frame_timestamps[i] - s.frame_timestamps[i-1], 2))
 
   # List of raw frame times.
   results.Add('frame_times', 'ms', frame_times)
 
+  # Arithmetic mean of frame times.
   mean_frame_time_ms = 1000 * statistics.ArithmeticMean(
-      s.total_time, s.screen_frame_count)
-  # Arithmetic mean of frame times. Not the generalized mean.
+      s.total_time, len(s.frame_timestamps))
   results.Add('mean_frame_time', 'ms', round(mean_frame_time_ms, 3))
 
   # Absolute discrepancy of frame time stamps.
-  jank = statistics.FrameDiscrepancy(s.screen_frame_timestamps)
+  jank = statistics.FrameDiscrepancy(s.frame_timestamps)
   results.Add('jank', '', round(jank, 4))
 
   # Are we hitting 60 fps for 95 percent of all frames? (Boolean value)
   # We use 17ms as a slightly looser threshold, instead of 1000.0/60.0.
   results.Add('mostly_smooth', '',
       statistics.Percentile(frame_times, 95.0) < 17.0)
 
 
 class MissingTimelineMarker(page_measurement.MeasurementFailure):
   def __init__(self, name):
     super(MissingTimelineMarker, self).__init__(
         'Timeline marker not found: ' + name)
 
 
 def FindTimelineMarker(timeline, name):
   """Find the timeline event with the given name.
 
   If there is not exactly one such timeline event, raise an error.
   """
   events = [s for s in timeline.GetAllEventsOfName(name)
             if s.parent_slice == None]
   if len(events) != 1:
     raise MissingTimelineMarker(name)
   return events[0]
-