Explicitly setting names for stories in unittests

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 16 matching lines @@
     self._options = options_for_unittests.GetCopy()
     # pylint: disable=protected-access
     self._measurement = blink_perf._BlinkPerfMeasurement()
     # pylint: enable=protected-access
 
   def _CreateStorySetForTestFile(self, test_file_name):
     story_set = story.StorySet(base_dir=self._BLINK_PERF_TEST_DATA_DIR,
         serving_dirs={self._BLINK_PERF_TEST_DATA_DIR,
                       self._BLINK_PERF_RESOURCES_DIR})
     page = page_module.Page('file://' + test_file_name, story_set,
-        base_dir=story_set.base_dir)
+        base_dir=story_set.base_dir, name=test_file_name)
     story_set.AddStory(page)
     return story_set
 
   def testBlinkPerfTracingMetricsForMeasureTime(self):
     results = self.RunMeasurement(measurement=self._measurement,
         ps=self._CreateStorySetForTestFile('append-child-measure-time.html'),
         options=self._options)
     self.assertFalse(results.failures)
     self.assertEquals(len(results.FindAllTraceValues()), 1)
 
@@ skipping 286 matching lines @@
 
     renderer_main.BeginSlice('blink', 'bar', 440, 455)
     renderer_main.BeginSlice('blink', 'foo', 480, 490)
     renderer_main.EndSlice(510, 510)
     renderer_main.EndSlice(510, 505)
 
     self.assertEquals(
         blink_perf._ComputeTraceEventsThreadTimeForBlinkPerf(
             model, renderer_main, ['foo', 'bar']),
             {'foo': [300], 'bar': [320]})