Explicitly setting story names for image_decoding_measurement story set.

tools/perf/page_sets/image_decoding_measurement.py

Index: tools/perf/page_sets/image_decoding_measurement.py
diff --git a/tools/perf/page_sets/image_decoding_measurement.py b/tools/perf/page_sets/image_decoding_measurement.py
index e101fff9d2ad65d1da22afaca7b6a8370932ed92..24325b59ae1df5ecb0832ff34c6c2f914ebf0a7a 100644
--- a/tools/perf/page_sets/image_decoding_measurement.py
+++ b/tools/perf/page_sets/image_decoding_measurement.py
@@ -7,9 +7,10 @@ from telemetry import story
 
 class ImageDecodingMeasurementPage(page_module.Page):
 
-  def __init__(self, url, page_set):
+  def __init__(self, url, page_set, name):
     super(ImageDecodingMeasurementPage, self).__init__(url=url,
-                                                       page_set=page_set)
+                                                       page_set=page_set,
+                                                       name=name)
     self.image_decoding_measurement_limit_results_to_min_iterations = True
 
   def RunNavigateSteps(self, action_runner):
@@ -23,7 +24,7 @@ class ImageDecodingMeasurementPageSet(story.StorySet):
   """ A directed benchmark of image decoding performance """
 
   def __init__(self):
-    super(ImageDecodingMeasurementPageSet, self).__init__()
+    super(ImageDecodingMeasurementPageSet, self).__init__(verify_names=True)
     self.image_decoding_measurement_limit_results_to_min_iterations = True
 
     urls_list = [
@@ -34,4 +35,4 @@ class ImageDecodingMeasurementPageSet(story.StorySet):
     ]
 
     for url in urls_list:
-      self.AddStory(ImageDecodingMeasurementPage(url, self))
+      self.AddStory(ImageDecodingMeasurementPage(url, self, url.split('/')[-1]))