[telemetry] Use startup_url to force a fresh browser for each page in TodoMVC

tools/perf/benchmarks/v8.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.
 import shlex
 
 from core import perf_benchmark
 
 from measurements import v8_detached_context_age_in_gc
 from measurements import v8_gc_times
 import page_sets
@@ skipping 115 matching lines @@
     category_filter.AddIncludedCategory('v8')
     category_filter.AddIncludedCategory('blink.console')
     options = timeline_based_measurement.Options(category_filter)
     options.SetLegacyTimelineBasedMetrics([v8_execution.V8ExecutionMetric()])
     return options
 
   @classmethod
   def Name(cls):
     return 'v8.todomvc'
 
-  @classmethod
-  def ShouldTearDownStateAfterEachStoryRun(cls):
-    return True
-
 
 # Disabled on reference builds because they don't support the new
 # Tracing.requestMemoryDump DevTools API. See http://crbug.com/540022.
 @benchmark.Disabled('reference', 'android')  # crbug.com/579546
 @benchmark.Disabled('win')  # https://crbug.com/590747
 class V8InfiniteScroll(_InfiniteScrollBenchmark):
   """Measures V8 GC metrics and memory usage while scrolling the top web pages.
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
 
   page_set = page_sets.InfiniteScrollPageSet
 
   @classmethod
   def Name(cls):
     return 'v8.infinite_scroll'
 
 
 @benchmark.Enabled('android')
 class V8MobileInfiniteScroll(_InfiniteScrollBenchmark):
   """Measures V8 GC metrics and memory usage while scrolling the top mobile
   web pages.
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
 
   page_set = page_sets.MobileInfiniteScrollPageSet
 
   @classmethod
   def Name(cls):
     return 'v8.mobile_infinite_scroll'