Add smoke test coverage for tracing metrics of measurePageLoad method

tools/perf/benchmarks/blink_perf_unittest.py

 # Copyright 2017 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 os
 import unittest
 
 from telemetry import story
 from telemetry.page import page as page_module
 from telemetry.testing import options_for_unittests
 from telemetry.testing import page_test_test_case
@@ skipping 64 matching lines @@
     self.assertEquals(len(frame_view_prepaints[0].values), 9)
     self.assertGreater(frame_view_prepaints[0].GetRepresentativeNumber, 0.1)
 
     frame_view_painttrees = results.FindAllPageSpecificValuesNamed(
         'FrameView::paintTree')
     self.assertEquals(len(frame_view_painttrees), 1)
     # color-changes-measure-frame-time.html specifies 9 iterationCount.
     self.assertEquals(len(frame_view_painttrees[0].values), 9)
     self.assertGreater(frame_view_painttrees[0].GetRepresentativeNumber, 0.1)
 
+  def testBlinkPerfTracingMetricsForMeasurePageLoadTime(self):
+    results = self.RunMeasurement(measurement=self._measurement,
+        ps=self._CreateStorySetForTestFile(
+            'simple-html-measure-page-load-time.html'),
+        options=self._options)
+    self.assertFalse(results.failures)
+    self.assertEquals(len(results.FindAllTraceValues()), 1)
+
+    create_child_frame = results.FindAllPageSpecificValuesNamed(
+        'WebLocalFrameImpl::createChildframe')
+    self.assertEquals(len(create_child_frame), 1)
+    # color-changes-measure-frame-time.html specifies 7 iterationCount.
+    self.assertEquals(len(create_child_frame[0].values), 7)
+    self.assertGreater(create_child_frame[0].GetRepresentativeNumber, 0.1)
+
+    post_layout_task = results.FindAllPageSpecificValuesNamed(
+        'FrameView::performPostLayoutTasks')
+    self.assertEquals(len(post_layout_task), 1)
+    # color-changes-measure-frame-time.html specifies 7 iterationCount.
+    self.assertEquals(len(post_layout_task[0].values), 7)
+    self.assertGreater(post_layout_task[0].GetRepresentativeNumber, 0.1)
+
+
   def testBlinkPerfTracingMetricsForMeasureAsync(self):
     results = self.RunMeasurement(measurement=self._measurement,
         ps=self._CreateStorySetForTestFile(
             'simple-blob-measure-async.html'),
         options=self._options)
     self.assertFalse(results.failures)
     self.assertEquals(len(results.FindAllTraceValues()), 1)
 
     blob_requests = results.FindAllPageSpecificValuesNamed(
         'BlobRequest')
@@ skipping 146 matching lines @@
     # & its overalapped wall-time with "blink_perf.run_test" is 80 ms, its
     # overlapped CPU time with "blink_perf.run_test" is
     # 80 * 40 / 100 = 32ms.
     foo_thread.BeginSlice('blink', 'foo', 500, 520)
     foo_thread.EndSlice(600, 560)
 
     self.assertEquals(
         blink_perf._ComputeTraceEventsThreadTimeForBlinkPerf(
             model, renderer_main, ['foo', 'bar', 'baz']),
         {'foo': [15, 32], 'bar': [20, 0], 'baz': [0, 0]})