Re-enable blink_perf.canvas on Windows

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 telemetry import benchmark
 from telemetry.core import util
 from telemetry import page as page_module
 from telemetry.page import page_set
@@ skipping 149 matching lines @@
 
   @classmethod
   def Name(cls):
     return 'blink_perf.css'
 
   def CreatePageSet(self, options):
     path = os.path.join(BLINK_PERF_BASE_DIR, 'CSS')
     return CreatePageSetFromPath(path, SKIPPED_FILE)
 
 
-@benchmark.Disabled('win')  # crbug.com/455796
 class BlinkPerfCanvas(benchmark.Benchmark):
   tag = 'canvas'
   test = _BlinkPerfMeasurement
 
   @classmethod
   def Name(cls):
     return 'blink_perf.canvas'
 
   def CreatePageSet(self, options):
     path = os.path.join(BLINK_PERF_BASE_DIR, 'Canvas')
@@ skipping 119 matching lines @@
   tag = 'xml_http_request'
   test = _BlinkPerfMeasurement
 
   @classmethod
   def Name(cls):
     return 'blink_perf.xml_http_request'
 
   def CreatePageSet(self, options):
     path = os.path.join(BLINK_PERF_BASE_DIR, 'XMLHttpRequest')
     return CreatePageSetFromPath(path, SKIPPED_FILE)