Explicitly setting story names for thread_times benchmarks

tools/perf/page_sets/key_idle_power_cases.py

 # Copyright 2015 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 page_sets import android_screen_restoration_shared_state
 
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 
 class KeyIdlePowerPage(page_module.Page):
 
   def __init__(self, url, page_set, turn_screen_off, duration_seconds=20,
                shared_page_state_class=shared_page_state.SharedMobilePageState):
     super(KeyIdlePowerPage, self).__init__(
         url=url,
         page_set=page_set,
         shared_page_state_class=(android_screen_restoration_shared_state
-            .AndroidScreenRestorationSharedState))
+            .AndroidScreenRestorationSharedState),
+        name=url.split('/')[-1])
     self._turn_screen_off = turn_screen_off
     self._duration_seconds = duration_seconds
 
   def RunNavigateSteps(self, action_runner):
     super(KeyIdlePowerPage, self).RunNavigateSteps(action_runner)
     action_runner.Wait(2)
     if self._turn_screen_off:
       action_runner.tab.browser.platform.android_action_runner.TurnScreenOff()
       # We're not interested in tracking activity that occurs immediately after
       # the screen is turned off. Several seconds should be enough time for the
@@ skipping 20 matching lines @@
         shared_page_state_class=(android_screen_restoration_shared_state
             .AndroidScreenRestorationSharedState))
     self._name = self.display_name + " (Long Idle)"
 
 
 class KeyIdlePowerCasesPageSet(story.StorySet):
 
   """ Key idle power cases """
 
   def __init__(self):
-    super(KeyIdlePowerCasesPageSet, self).__init__()
+    super(KeyIdlePowerCasesPageSet, self).__init__(verify_names=True)
 
     foreground_urls_list = [
       # Why: Ensure minimal activity for static, empty pages in the foreground.
       'file://key_idle_power_cases/blank.html',
     ]
 
     for url in foreground_urls_list:
       self.AddStory(KeyIdlePowerPage(url, self, False))
 
     background_urls_list = [
       # Why: Ensure animated GIFs aren't processed when Chrome is backgrounded.
       'file://key_idle_power_cases/animated-gif.html',
       # Why: Ensure CSS animations aren't processed when Chrome is backgrounded.
       'file://key_idle_power_cases/css-animation.html',
       # Why: Ensure rAF is suppressed when Chrome is backgrounded.
       'file://key_idle_power_cases/request-animation-frame.html',
       # Why: Ensure setTimeout is throttled when Chrome is backgrounded.
       'file://key_idle_power_cases/set-timeout.html',
     ]
 
     for url in background_urls_list:
       self.AddStory(KeyIdlePowerPage(url, self, True))
 
     # Why: Ensure that activity strictly diminishes the longer the idle time.
     self.AddStory(KeyLongIdlePowerPage(
         'file://key_idle_power_cases/set-timeout.html', self, True))