[telemetry] Support absolute paths by changing file:/// to file://. More robust file path handling.

tools/perf/benchmarks/dom_perf.py

 # Copyright (c) 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 json
 import math
 import os
 
 from telemetry import test
 from telemetry.core import util
@@ skipping 56 matching lines @@
 class DomPerf(test.Test):
   """A suite of JavaScript benchmarks for exercising the browser's DOM.
 
   The final score is computed as the geometric mean of the individual results.
   Scores are not comparable across benchmark suite versions and higher scores
   means better performance: Bigger is better!"""
   test = DomPerfMeasurement
 
   def CreatePageSet(self, options):
     dom_perf_dir = os.path.join(util.GetChromiumSrcDir(), 'data', 'dom_perf')
-    base_page = 'file:///run.html?reportInJS=1&run='
+    base_page = 'file://run.html?reportInJS=1&run='
     return page_set.PageSet.FromDict({
         'pages': [
           { 'url': base_page + 'Accessors' },
           { 'url': base_page + 'CloneNodes' },
           { 'url': base_page + 'CreateNodes' },
           { 'url': base_page + 'DOMDivWalk' },
           { 'url': base_page + 'DOMTable' },
           { 'url': base_page + 'DOMWalk' },
           { 'url': base_page + 'Events' },
           { 'url': base_page + 'Get+Elements' },
           { 'url': base_page + 'GridSort' },
           { 'url': base_page + 'Template' }
           ]
         }, dom_perf_dir)