Explicitly setting story names for start_with_* benchmarks

tools/perf/page_sets/blank_page_with_extension_profile.py

Index: tools/perf/page_sets/blank_page_with_extension_profile.py
diff --git a/tools/perf/page_sets/blank_page_with_extension_profile.py b/tools/perf/page_sets/blank_page_with_extension_profile.py
index b4c5b594e760b45e31f6880b494027dc7ab0cda0..a20afee29837028edef558337ab26dcf5d843941 100644
--- a/tools/perf/page_sets/blank_page_with_extension_profile.py
+++ b/tools/perf/page_sets/blank_page_with_extension_profile.py
@@ -10,17 +10,19 @@ from telemetry import story
 class BlankPageWithExtensionProfile(page_module.Page):
   """A single blank page loaded with a profile with many extensions."""
 
-  def __init__(self, url, page_set):
+  def __init__(self, url, page_set, name):
     super(BlankPageWithExtensionProfile, self).__init__(
         url=url, page_set=page_set,
         shared_page_state_class=extension_profile_shared_state.
-                                ExtensionProfileSharedState)
+                                ExtensionProfileSharedState,
+        name=name)
 
 
 class BlankPageSetWithExtensionProfile(story.StorySet):
   """PageSet tied to BlankPageWithExtensionProfile."""
 
   def __init__(self):
-    super(BlankPageSetWithExtensionProfile, self).__init__()
+    super(BlankPageSetWithExtensionProfile, self).__init__(verify_names=True)
     self.AddStory(BlankPageWithExtensionProfile(
-        'file://blank_page/blank_page.html', self))
+        'file://blank_page/blank_page.html', self,
+        'blank_page.html'))