[Telemetry] Print trace counters with trace events.

tools/perf/metrics/timeline.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 collections
 
 from metrics import Metric
 from telemetry.page import page_measurement
 
 TRACING_MODE = 'tracing-mode'
 TIMELINE_MODE = 'timeline-mode'
@@ skipping 55 matching lines @@
     for e in events:
       events_by_name[e.name].append(e)
 
     for event_name, event_group in events_by_name.iteritems():
       times = [event.self_time for event in event_group]
       total = sum(times)
       biggest_jank = max(times)
       results.Add(event_name, 'ms', total)
       results.Add(event_name + '_max', 'ms', biggest_jank)
       results.Add(event_name + '_avg', 'ms', total / len(times))
+
+    counters_by_name = self._thread_for_tab.parent.counters
+    for counter_name, counter in counters_by_name.iteritems():
+      total = sum(counter.totals)
+      results.Add(counter_name, 'count', total)
+      results.Add(counter_name + '_avg', 'count', total / len(counter.totals))