telemetry: Add RenderingStatsUnitTest.

tools/perf/metrics/rendering_stats.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 operator import attrgetter
 
 
 class RenderingStats(object):
   def __init__(self, renderer_process, timeline_markers):
     """
     Utility class for extracting rendering statistics from the timeline (or
     other loggin facilities), and providing them in a common format to classes
     that compute benchmark metrics from this data.
 
     Stats can either be numbers, or lists of numbers. Classes that calculate
     metrics from the stats must be able to handle both cases. The length of
     different list stats may vary.
 
     All *_time values are measured in milliseconds.
     """
     assert(len(timeline_markers) > 0)
     self.renderer_process = renderer_process
-    self.start = timeline_markers[0].start
-    self.end = timeline_markers[-1].start + timeline_markers[-1].duration
 
-    self.frame_count = []
     self.frame_timestamps = []
     self.frame_times = []
     self.paint_time = []
     self.painted_pixel_count = []
     self.record_time = []
     self.recorded_pixel_count = []
     self.rasterize_time = []
     self.rasterized_pixel_count = []
 
     for marker in timeline_markers:
@@ skipping 18 matching lines @@
     events.sort(key=attrgetter('start'))
 
     first_frame = True
     for event in events:
       # TODO(ernstm): remove screen_frame_count when RenderingStats
       # cleanup CL was picked up by the reference build.
       if 'frame_count' in event.args['data']:
         frame_count = event.args['data']['frame_count']
       else:
         frame_count = event.args['data']['screen_frame_count']
-      self.frame_count.append(frame_count)
       if frame_count > 1:
         raise ValueError, 'trace contains multi-frame render stats'
       if frame_count == 1:
         self.frame_timestamps.append(
             event.start)
         if not first_frame:
           self.frame_times.append(round(self.frame_timestamps[-1] -
                                         self.frame_timestamps[-2], 2))
         first_frame = False
       self.paint_time.append(1000.0 *
@@ skipping 21 matching lines @@
     events.sort(key=attrgetter('start'))
 
     first_frame = True
     for event in events:
       # TODO(ernstm): remove screen_frame_count when RenderingStats
       # cleanup CL was picked up by the reference build.
       if 'frame_count' in event.args['data']:
         frame_count = event.args['data']['frame_count']
       else:
         frame_count = event.args['data']['screen_frame_count']
-      self.frame_count.append(frame_count)
       if frame_count > 1:
         raise ValueError, 'trace contains multi-frame render stats'
       if frame_count == 1:
         self.frame_timestamps.append(
             event.start)
         if not first_frame:
           self.frame_times.append(round(self.frame_timestamps[-1] -
                                         self.frame_timestamps[-2], 2))
         first_frame = False
       self.rasterize_time.append(1000.0 *
           event.args['data']['rasterize_time'])
       self.rasterized_pixel_count.append(
           event.args['data']['rasterized_pixel_count'])