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

content/test/gpu/gpu_tests/webgl_conformance.py

 # Copyright (c) 2012 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 optparse
 import os
 import sys
 
 import webgl_conformance_expectations
 
@@ skipping 86 matching lines @@
       'pages': []
     }
 
     pages = page_set_dict['pages']
 
     for test in tests:
       pages.append({
         'name': 'WebglConformance.%s' %
             test.replace('/', '_').replace('-', '_').
             replace('\\', '_').rpartition('.')[0].replace('.', '_'),
-        'url': 'file:///' + test,
+        'url': 'file://' + test,
         'script_to_evaluate_on_commit': conformance_harness_script,
         'navigate_steps': [
           {'action': 'navigate'},
           {
             'action': 'wait',
             'javascript': 'webglTestHarness._finished',
             'timeout': 120
           }
         ]
       })
@@ skipping 41 matching lines @@
 
         if '.txt' in test_name:
           include_path = os.path.join(current_dir, test_name)
           test_paths += WebglConformance._ParseTests(
             include_path, version)
         else:
           test = os.path.join(current_dir, test_name)
           test_paths.append(test)
 
     return test_paths