Explicitly setting story names for the blink story sets.

tools/perf/benchmarks/blink_perf.py

 # Copyright 2013 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
 
 from core import path_util
 from core import perf_benchmark
 
 from page_sets import webgl_supported_shared_state
@@ skipping 49 matching lines @@
     if os.path.exists(skipped_file):
       for line in open(skipped_file, 'r').readlines():
         line = line.strip()
         if line and not line.startswith('#'):
           skipped_path = os.path.join(os.path.dirname(skipped_file), line)
           skipped.append(skipped_path.replace('/', os.sep))
     _AddDir(path, tuple(skipped))
   else:
     _AddPage(path)
   ps = story.StorySet(base_dir=os.getcwd() + os.sep,
-                      serving_dirs=serving_dirs)
+                      serving_dirs=serving_dirs,
+                      verify_names=True)
+
+  all_urls = [p.rstrip('/') for p in page_urls]
+  common_prefix = os.path.dirname(os.path.commonprefix(all_urls))
   for url in page_urls:
+    name = url[len(common_prefix):].strip('/')
     ps.AddStory(page_module.Page(
         url, ps, ps.base_dir,
-        shared_page_state_class=shared_page_state_class))
+        shared_page_state_class=shared_page_state_class,
+        name=name))
   return ps
 
 
 def _ComputeTraceEventsThreadTimeForBlinkPerf(
     model, renderer_thread, trace_events_to_measure):
   """ Compute the CPU duration for each of |trace_events_to_measure| during
   blink_perf test.
 
   Args:
     renderer_thread: the renderer thread which run blink_perf test.
@@ skipping 254 matching lines @@
 
 
 @benchmark.Owner(emails=['hayato@chromium.org'])
 class BlinkPerfShadowDOM(_BlinkPerfBenchmark):
   tag = 'shadow_dom'
   subdir = 'ShadowDOM'
 
   @classmethod
   def ShouldDisable(cls, possible_browser):  # http://crbug.com/702319
     return possible_browser.platform.GetDeviceTypeName() == 'Nexus 5X'