[Telemetry] Show V8 metrics in page_cyclers

BUG=

Review URL: https://codereview.chromium.org/197213022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257762 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 58 insertions, 0 deletions

diff --git a/tools/perf/measurements/page_cycler.py b/tools/perf/measurements/page_cycler.py
index 01a4628..498cd5d 100644
--- a/tools/perf/measurements/page_cycler.py
+++ b/tools/perf/measurements/page_cycler.py
@@ -23,6 +23,7 @@ from metrics import iometric
 from metrics import memory
 from metrics import power
 from metrics import speedindex
+from metrics import v8
 from metrics import v8_object_stats
 from telemetry.core import util
 from telemetry.page import page_measurement
@@ -38,6 +39,7 @@ class PageCycler(page_measurement.PageMeasurement):
     self._speedindex_metric = speedindex.SpeedIndexMetric()
     self._memory_metric = None
     self._power_metric = power.PowerMetric()
+    self._v8_metric = v8.V8Metric()
     self._cpu_metric = None
     self._v8_object_stats_metric = None
     self._cold_run_start_index = None
@@ -83,6 +85,7 @@ class PageCycler(page_measurement.PageMeasurement):
       self._speedindex_metric.Start(page, tab)
 
   def DidNavigateToPage(self, page, tab):
+    self._v8_metric.Start(page, tab)
     self._memory_metric.Start(page, tab)
     self._power_metric.Start(page, tab)
     # TODO(qyearsley): Uncomment the following line and move it to
@@ -146,8 +149,11 @@ class PageCycler(page_measurement.PageMeasurement):
 
     self._has_loaded_page[page.url] += 1
 
+    self._v8_metric.Stop(page, tab)
     self._power_metric.Stop(page, tab)
     self._memory_metric.Stop(page, tab)
+    self._v8_metric.AddResults(
+        tab, results, chart_name=chart_name_prefix+'times')
     self._memory_metric.AddResults(tab, results)
     self._power_metric.AddResults(tab, results)
 
diff --git a/tools/perf/measurements/page_cycler_unittest.py b/tools/perf/measurements/page_cycler_unittest.py
index 37f8dc7..be6c6ac 100644
--- a/tools/perf/measurements/page_cycler_unittest.py
+++ b/tools/perf/measurements/page_cycler_unittest.py
@@ -32,7 +32,21 @@ class MockMemoryMetric(object):
   def AddSummaryResults(self, tab, results):
     pass
 
+class MockV8Metric(object):
+  def __init__(self):
+    pass
+
+  def Start(self, page, tab):
+    pass
+
+  def Stop(self, page, tab):
+    pass
+
+  def AddResults(self, tab, results, chart_name):
+    pass
+
 
+# Used to mock loading a page.
 class FakePage(object):
   """Used to mock loading a page."""
   def __init__(self, url):
@@ -63,6 +77,8 @@ class PageCyclerUnitTest(unittest.TestCase):
     cycler.ProcessCommandLineArgs(parser, options)
     cycler.CustomizeBrowserOptions(options)
 
+    cycler._v8_metric = MockV8Metric()
+
     if setup_memory_module:
       # Mock out memory metrics; the real ones require a real browser.
       mock_memory_metric = MockMemoryMetric()
diff --git a/tools/perf/metrics/v8.py b/tools/perf/metrics/v8.py
new file mode 100644
index 0000000..7727c63
--- /dev/null
+++ b/tools/perf/metrics/v8.py
@@ -0,0 +1,36 @@
+# 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 collections
+
+from metrics import timeline
+from metrics.timeline import TimelineMetric
+
+class V8Metric(TimelineMetric):
+  """A metric for measuring V8 functionalities."""
+
+  def __init__(self):
+    super(V8Metric, self).__init__(timeline.TRACING_MODE)
+    self.report_main_thread_only = False
+
+  # Optional argument chart_name is not in base class Metric.
+  # pylint: disable=W0221
+  def AddResults(self, _, results, chart_name=None):
+    assert self._model
+    events_by_name = collections.defaultdict(list)
+    for thread in self.renderer_process.threads.itervalues():
+      events = thread.all_slices
+
+      for e in events:
+        if e.name.startswith('V8'):
+          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)
+
+        # Results objects cannot contain the '.' character, so remove that here.
+        sanitized_event_name = event_name.replace('.', '_')
+
+        results.Add(sanitized_event_name, 'ms', total, chart_name=chart_name)