Move blink_perf.xml_http_request benchmark to tools/perf/contrib/ directory

tools/perf/core/path_util.py

 # Copyright 2015 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
 import sys
 
 
 def GetChromiumSrcDir():
   return os.path.abspath(os.path.join(
@@ skipping 10 matching lines @@
 
 
 def GetPerfStorySetsDir():
   return os.path.join(GetPerfDir(), 'page_sets')
 
 
 def GetPerfBenchmarksDir():
   return os.path.join(GetPerfDir(), 'benchmarks')
 
 
+def GetPerfContribDir():
+  return os.path.join(GetPerfDir(), 'contrib')
+
+
 def AddTelemetryToPath():
   telemetry_path = GetTelemetryDir()
   if telemetry_path not in sys.path:
     sys.path.insert(1, telemetry_path)
 
 
 def AddPyUtilsToPath():
   py_utils_dir = os.path.join(
       GetChromiumSrcDir(), 'third_party', 'catapult', 'common', 'py_utils')
   if py_utils_dir not in sys.path:
     sys.path.insert(1, py_utils_dir)