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

tools/perf/chrome_telemetry_build/chromium_config.py

Index: tools/perf/chrome_telemetry_build/chromium_config.py
diff --git a/tools/perf/chrome_telemetry_build/chromium_config.py b/tools/perf/chrome_telemetry_build/chromium_config.py
index dcbc7b86576a12b001c447d1a848b3793d21f099..a39dca9296f96f752656d81cfc99e676c39044e5 100644
--- a/tools/perf/chrome_telemetry_build/chromium_config.py
+++ b/tools/perf/chrome_telemetry_build/chromium_config.py
@@ -2,15 +2,25 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import logging
 import os
+import sys
 
-from core import path_util
+
+def GetChromiumSrcDir():
+  return os.path.abspath(
+      os.path.join(os.path.abspath(__file__), '..', '..', '..', '..'))
+
+
+def GetTelemetryDir():
+  return os.path.join(GetChromiumSrcDir(), 'third_party', 'catapult',
+                      'telemetry')
 
 
 CLIENT_CONFIG_PATH = os.path.join(
     os.path.dirname(os.path.abspath(__file__)), 'binary_dependencies.json')
 
-path_util.AddTelemetryToPath()
+sys.path.insert(1, os.path.join(GetTelemetryDir()))
 
 from telemetry import project_config
 
@@ -18,11 +28,20 @@
 class ChromiumConfig(project_config.ProjectConfig):
 
   def __init__(self, top_level_dir=None, benchmark_dirs=None,
-               client_configs=None, default_chrome_root=None):
+               client_configs=None,
+               default_chrome_root=GetChromiumSrcDir()):
     if client_configs is None:
       client_configs = [CLIENT_CONFIG_PATH]
-    if default_chrome_root is None:
-      default_chrome_root = path_util.GetChromiumSrcDir()
+
+    perf_dir = os.path.join(GetChromiumSrcDir(), 'tools', 'perf')
+    if not benchmark_dirs:
+      benchmark_dirs = [os.path.join(perf_dir, 'benchmarks')]
+      logging.info('No benchmark directories specified. Defaulting to %s',
+                   benchmark_dirs)
+    if not top_level_dir:
+      top_level_dir = perf_dir
+      logging.info('No top level directory specified. Defaulting to %s',
+                   top_level_dir)
 
     super(ChromiumConfig, self).__init__(
         top_level_dir=top_level_dir, benchmark_dirs=benchmark_dirs,