Task Execution Duration metrics added as a new benchmark

tools/perf/measurements/task_execution_time_unittest.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.
+
+from measurements import task_execution_time
+from telemetry.core import wpr_modes
+from telemetry.page import page as page_module
+from telemetry.unittest import options_for_unittests
+from telemetry.unittest import page_test_test_case
+
+class TestTaskExecutionTimePage(page_module.Page):
+  def __init__(self, page_set, base_dir):
+    super(TestTaskExecutionTimePage, self).__init__('file://blank.html',
+                                          page_set, base_dir)
+
+  def RunTaskExecutionTime(self, action_runner):
+    interaction = action_runner.BeginGestureInteraction(
+           'ScrollAction', is_smooth=True)
+    action_runner.ScrollPage()
+    interaction.End()
+
+
+def dump(obj):
+  for attr in dir(obj):
+    print "obj.%s = %s" % (attr, getattr(obj, attr))
+
+class TaskExecutionTimeUnitTest(page_test_test_case.PageTestTestCase):
+  """Unit test for task execution time measurement
+  """

[Sami, 2014/10/10 17:41:43]

Looks like this would fit on the previous line. The comment sounds a bit
redundant however.

[picksi1, 2014/10/13 15:19:39]

Removed this comment as it is redundant.

+
+  def setUp(self):
+    self._options = options_for_unittests.GetCopy()
+    self._options.browser_options.wpr_mode = wpr_modes.WPR_OFF
+
+  def testCorrectNumberOfResultsReturned(self):
+    ps = self.CreateEmptyPageSet()
+    ps.AddPage(TestTaskExecutionTimePage(ps, ps.base_dir))
+    measurement = task_execution_time.TaskExecutionTime()
+
+    results = self.RunMeasurement(measurement, ps, options=self._options)
+
+    self.assertEquals(

[Sami, 2014/10/10 17:41:43]

nit pick: What if there are less than 10 tasks in total? :)

[picksi1, 2014/10/13 15:19:39]

Hmmm. I did consider hand-creating some event data to pass into the code, but
this felt like over-kill when the existing test page seems to work OK. I'm not
sure how much time to spend this?

+        task_execution_time.TaskExecutionTime.GetExpectedResultCount(),
+        len(results.all_page_specific_values))
+
+  def testResultsAreDecreasing(self):
+    ps = self.CreateEmptyPageSet()
+    ps.AddPage(TestTaskExecutionTimePage(ps, ps.base_dir))
+    measurement = task_execution_time.TaskExecutionTime()
+
+    results = self.RunMeasurement(measurement, ps, options=self._options)
+
+    for index in xrange(len(results.all_page_specific_values) - 1):
+      self.assertTrue(
+          results.all_page_specific_values[index].value >=
+          results.all_page_specific_values[index+1].value)

[Sami, 2014/10/10 17:41:43]

nit: spaces around the plus.

A fancier way to do this, but what you have works too:

  for first, second in zip(results.all_page_specific_values,
                           results.all_page_specific_values[1:]):
    self.assertGreaterEqual(first.value, second.value)

[picksi1, 2014/10/13 15:19:39]

Nice. Petr, Simon and myself discussed the various ways of doing this. Your
option is neatest!