[telemetry] Add a V8GCTimes measurement and benchmarks.

tools/telemetry/telemetry/web_perf/metrics/v8_stats.py

Index: tools/telemetry/telemetry/web_perf/metrics/v8_stats.py
diff --git a/tools/telemetry/telemetry/web_perf/metrics/v8_stats.py b/tools/telemetry/telemetry/web_perf/metrics/v8_stats.py
deleted file mode 100644
index 49a11a5e819a4e100100898cb01c9172806b5196..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/web_perf/metrics/v8_stats.py
+++ /dev/null
@@ -1,64 +0,0 @@
-# Copyright 2014 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.
-
-class EventStats(object):
-  def __init__(self, src_event_name, result_name, result_description):
-    self.src_event_name = src_event_name
-    self.result_name = result_name
-    self.result_description = result_description
-    self.thread_duration = 0.0
-    self.thread_duration_inside_idle = 0.0
-
-  @property
-  def thread_duration_outside_idle(self):
-    return self.thread_duration - self.thread_duration_inside_idle
-
-
-def _FindEventStats(event_stats_list, event_name):
-  for event_stats in event_stats_list:
-    if event_stats.src_event_name == event_name:
-      return event_stats
-  return None
-
-
-def _IsDescendentOfIdleNotification(event):
-  parent = event.parent_slice
-  while parent:
-    if parent.name == 'V8.GCIdleNotification':
-      return True
-    parent = parent.parent_slice
-  return False
-
-class V8Stats(object):
-  def __init__(self, renderer_thread, interaction_records):
-    self.all_event_stats = [
-        EventStats('V8.GCIncrementalMarking',
-                   'incremental_marking',
-                   'total thread duration spent in incremental marking steps'),
-        EventStats('V8.GCScavenger',
-                   'scavenger',
-                   'total thread duration spent in scavenges'),
-        EventStats('V8.GCCompactor',
-                   'mark_compactor',
-                   'total thread duration spent in mark-sweep-compactor')]
-
-    # Find all GC events contained in an interaction record
-    for event in renderer_thread.IterAllSlices():
-      event_stats = _FindEventStats(self.all_event_stats, event.name)
-      if not event_stats:
-        continue
-      for r in interaction_records:
-        if not r.GetBounds().ContainsInterval(event.start, event.end):
-          continue
-        event_stats.thread_duration += event.thread_duration
-        if _IsDescendentOfIdleNotification(event):
-          event_stats.thread_duration_inside_idle += event.thread_duration
-
-  @property
-  def total_gc_thread_duration(self):
-    return sum(x.thread_duration for x in self.all_event_stats)
-
-  @property
-  def total_gc_thread_duration_outside_idle(self):
-    return sum(x.thread_duration_outside_idle for x in self.all_event_stats)