Revert of [tools/perf] Remove default values of benchmark_dirs and top_level_dir in chromium_config module

tools/perf/core/perf_data_generator.py

 #!/usr/bin/env python
 # Copyright 2016 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.
 
 """Script to generate chromium.perf.json and chromium.perf.fyi.json in
 the src/testing/buildbot directory and benchmark.csv in the src/tools/perf
 directory. Maintaining these files by hand is too unwieldy.
 """
 import argparse
 import collections
 import csv
 import json
 import os
 import re
 import sys
 import sets
 
-from core import path_util
-path_util.AddTelemetryToPath()
+from chrome_telemetry_build import chromium_config
 
+sys.path.append(chromium_config.GetTelemetryDir())
 from telemetry import benchmark as benchmark_module
 from telemetry import decorators
 from telemetry.core import discover
 from telemetry.util import bot_utils
 
 
 SCRIPT_TESTS = [
   {
     'args': [
       'gpu_perftests',
@@ skipping 934 matching lines @@
       return 0
     else:
       print ('The perf JSON config files are not up-to-date. Please run %s '
              'without --validate-only flag to update the perf JSON '
              'configs and benchmark.csv.') % sys.argv[0]
       return 1
   else:
     update_all_tests([fyi_waterfall, waterfall])
     update_benchmark_csv()
   return 0