Explicitly setting names for stories in unittests

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 telemetry import decorators
 from telemetry.internal.results import page_test_results
 from telemetry.page import page as page_module
 from telemetry.testing import options_for_unittests
 from telemetry.testing import page_test_test_case
 from telemetry.timeline import model as model_module
 from telemetry.timeline import slice as slice_data
 from telemetry.util import wpr_modes
 
 from measurements import task_execution_time
 
 
 class TestTaskExecutionTimePage(page_module.Page):
 
   def __init__(self, page_set, base_dir):
     super(TestTaskExecutionTimePage, self).__init__(
-        'file://blank.html', page_set, base_dir)
+        'file://blank.html', page_set, base_dir, name='blank.html')
 
   def RunPageInteractions(self, action_runner):
     with action_runner.CreateGestureInteraction('ScrollAction'):
       action_runner.ScrollPage()
 
 
 # Disable for accessing private API of task_execution_time.
 # pylint: disable=protected-access
 class TaskExecutionTimeUnitTest(page_test_test_case.PageTestTestCase):
 
@@ skipping 233 matching lines @@
         None,
         'category',
         name,
         timestamp,
         duration,
         timestamp,
         duration,
         [])
     self._renderer_thread.all_slices.append(new_slice)
     return new_slice