[Telemetry] Change the page's file_path param to base_dir param

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 core import perf_benchmark
 
 from telemetry import benchmark
 from telemetry.core import util
@@ skipping 43 matching lines @@
     skipped = []
     if os.path.exists(skipped_file):
       for line in open(skipped_file, 'r').readlines():
         line = line.strip()
         if line and not line.startswith('#'):
           skipped_path = os.path.join(os.path.dirname(skipped_file), line)
           skipped.append(skipped_path.replace('/', os.sep))
     _AddDir(path, tuple(skipped))
   else:
     _AddPage(path)
-  ps = page_set.PageSet(file_path=os.getcwd()+os.sep,
+  ps = page_set.PageSet(base_dir=os.getcwd()+os.sep,
                         serving_dirs=serving_dirs)
   for url in page_urls:
     ps.AddUserStory(page_module.Page(
       url, ps, ps.base_dir,
       shared_page_state_class=shared_page_state_class))
   return ps
 
 
 class _BlinkPerfMeasurement(page_test.PageTest):
   """Tuns a blink performance test and reports the results."""
@@ skipping 239 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)