Revert of Disable storage.indexeddb_endure_tracing.reference perf test

tools/perf/benchmarks/indexeddb_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.
 
 """Runs Chromium's IndexedDB performance test. These test:
 
 Databases:
   create/delete
 Keys:
   create/delete
 Indexes:
   create/delete
 Data access:
   Random read/write
   Read cache
 Cursors:
   Read & random writes
   Walking multiple
   Seeking.
 """
 
 import json
 import os
 
 from core import perf_benchmark
 
-from telemetry import benchmark
 from telemetry import page as page_module
 from telemetry import story
 from telemetry.core import util
 from telemetry.page import page_test
 from telemetry.value import scalar
 
 from metrics import memory
 from metrics import power
 
 import page_sets
@@ skipping 72 matching lines @@
 class IndexedDbOriginalSectioned(perf_benchmark.PerfBenchmark):
   """Chromium's IndexedDB Performance tests."""
   test = _IndexedDbMeasurement
   page_set = page_sets.IndexedDBEndurePageSet
 
   @classmethod
   def Name(cls):
     return 'storage.indexeddb_endure'
 
 
-@benchmark.Disabled('reference') # http://crbug.com/534409
 class IndexedDbTracing(perf_benchmark.PerfBenchmark):
   """IndexedDB Performance tests that use tracing."""
   page_set = page_sets.IndexedDBEndurePageSet
 
   def CreateTimelineBasedMeasurementOptions(self):
     cat_filter = tracing_category_filter.CreateMinimalOverheadFilter()
     cat_filter.AddIncludedCategory(IDB_CATEGORY)
     cat_filter.AddIncludedCategory(TIMELINE_REQUIRED_CATEGORY)
 
     return timeline_based_measurement.Options(
         overhead_level=cat_filter)
 
   @classmethod
   def Name(cls):
     return 'storage.indexeddb_endure_tracing'
 
   @classmethod
   def ValueCanBeAddedPredicate(cls, value, is_first_result):
     return 'idb' in value.name