Implements AddStartupEventsForTelemetry() in startup_metric_utils.cc for in-coming startup telemetry

tools/perf/benchmarks/start_with_url2.py

+# 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.
+
+import page_sets
+from core import perf_benchmark
+from telemetry import benchmark
+from telemetry.timeline import tracing_category_filter
+from telemetry.web_perf import timeline_based_measurement
+from telemetry.web_perf.metrics import startup
+from metrics import keychain_metric
+
+
+class _StartWithUrlTBM(perf_benchmark.PerfBenchmark):
+  page_set = page_sets.StartupPagesPageSetTBM
+
+  @classmethod
+  def Name(cls):
+    # TODO(gabadie): We don't want to replace start_with_url.* yet.
+    return 'start_with_url2.startup_pages'
+
+  def SetExtraBrowserOptions(self, options):
+    options.AppendExtraBrowserArgs([
+        '--enable-stats-collection-bindings'
+    ])
+    keychain_metric.KeychainMetric.CustomizeBrowserOptions(options)
+
+  def CreateTimelineBasedMeasurementOptions(self):
+    # Enable only memory-infra, to get memory dumps, and blink.console, to get
+    # the timeline markers used for mapping threads to tabs.
+    trace_memory = tracing_category_filter.TracingCategoryFilter(
+        filter_string='startup,blink.user_timing')
+    options = timeline_based_measurement.Options(overhead_level=trace_memory)
+    options.SetTimelineBasedMetrics(
+        [startup.StartupTimelineMetric()])
+    return options
+
+
+@benchmark.Enabled('has tabs')
+@benchmark.Enabled('android')
+@benchmark.Disabled('chromeos', 'linux', 'mac', 'win')
+class StartWithUrlColdTBM(_StartWithUrlTBM):
+  """Measure time to start Chrome cold with startup URLs"""
+  options = {'pageset_repeat': 5}
+
+  def SetExtraBrowserOptions(self, options):
+      options.clear_sytem_cache_for_browser_and_profile_on_start = True
+      super(StartWithUrlColdTBM, self).SetExtraBrowserOptions(options)
+
+  @classmethod
+  def Name(cls):
+    return 'start_with_url2.cold.startup_pages'
+
+
+@benchmark.Enabled('has tabs')
+@benchmark.Enabled('android')
+@benchmark.Disabled('chromeos', 'linux', 'mac', 'win')
+class StartWithUrlWarmTBM(_StartWithUrlTBM):
+  """Measure time to start Chrome warm with startup URLs"""
+  options = {'pageset_repeat': 11}
+
+  @classmethod
+  def Name(cls):
+    return 'start_with_url2.warm.startup_pages'
+
+  @classmethod
+  def ValueCanBeAddedPredicate(cls, _, is_first_result):
+    # Ignores first results because the first invocation is actualy cold since
+    # we are loading the profile for the first time.
+    return not is_first_result