Explictly setting story names for rasterize_and_record_micro story sets

tools/perf/page_sets/partial_invalidation_cases.py

 # Copyright 2016 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.page import page as page_module
 from telemetry import story
 
 # Even though we don't specialize page behavior directly, we have to define our
 # own page class so that |story.serving_dir| fetched from the StorySet will
 # reflect the path to our containing directory, under which we serve local files
 # for recording. See also initialization of |base_dir| in telemetry's page.Page
 # constructor, which is in turn referenced by |file_path_url|.
 class PartialInvalidationCasesPage(page_module.Page):
 
   def __init__(self, url, page_set):
     super(PartialInvalidationCasesPage, self).__init__(
-        url=url, page_set=page_set)
+        url=url, page_set=page_set, name=url.split('/')[-1])
 
 
 class PartialInvalidationCasesPageSet(story.StorySet):
 
   """ Page set consisting of pages specialized for partial invalidation,
     for example, pages with many elements. """
 
   def __init__(self):
     super(PartialInvalidationCasesPageSet, self).__init__(
-        cloud_storage_bucket=story.PARTNER_BUCKET)
+        cloud_storage_bucket=story.PARTNER_BUCKET, verify_names=True)
 
     other_urls = [
         # Why: Reduced test case similar to the single page html5 spec wherein
         # we saw a performance regression demonstrable via a small partial
         # invalidation.
         'file://partial_invalidation_cases/800_relpos_divs.html',
     ]
 
     for url in other_urls:
       self.AddStory(PartialInvalidationCasesPage(url, self))