Explictly setting story names for rasterize_and_record_micro story sets

tools/perf/page_sets/key_mobile_sites_pages.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.page import page as page_module
 from telemetry.page import shared_page_state
 
 
 class KeyMobileSitesPage(page_module.Page):
 
   def __init__(self, url, page_set, name='', tags=None):
+    if name == '':
+      name = url
     super(KeyMobileSitesPage, self).__init__(
         url=url, page_set=page_set, name=name,
         shared_page_state_class=shared_page_state.SharedMobilePageState,
         credentials_path='data/credentials.json', tags=tags)
     self.archive_data_file = 'data/key_mobile_sites.json'
 
 
 class CapitolVolkswagenPage(KeyMobileSitesPage):
 
   """ Why: Typical mobile business site """
@@ skipping 205 matching lines @@
 class AmazonNicolasCagePage(KeyMobileSitesPage):
 
   """
   Why: #1 world commerce website by visits; #3 commerce in the US by time spent
   """
 
   def __init__(self, page_set):
     super(AmazonNicolasCagePage, self).__init__(
       url='http://www.amazon.com/gp/aw/s/ref=is_box_?k=nicolas+cage',
       page_set=page_set)