Add devil dependencies config for performance tests.

tools/perf/chrome_telemetry_build/chromium_config.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 logging
 import os
 import sys
 
 
 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')
 
 sys.path.insert(1, os.path.join(GetTelemetryDir()))
+sys.path.insert(1, os.path.join(GetChromiumSrcDir(), 'build', 'android'))
 
 from telemetry import project_config
+from telemetry.core import util
+import devil_chromium  # pylint: disable=import-error
 
 
 class ChromiumConfig(project_config.ProjectConfig):
 
   def __init__(self, top_level_dir=None, benchmark_dirs=None,
                client_configs=None,
                default_chrome_root=GetChromiumSrcDir()):
     if client_configs is None:
       client_configs = [CLIENT_CONFIG_PATH]
 
     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,
         client_configs=client_configs, default_chrome_root=default_chrome_root)
+
+    for chromium_out_dir in util.GetBuildDirectories():
+      if os.path.exists(chromium_out_dir):
+        # pylint: disable=undefined-variable
+        devil_chromium.Initialize(output_directory=chromium_out_dir)

[nednguyen, 2017/01/20 16:02:11]

Hmhh, what is this for? 

[jbudorick, 2017/01/20 16:04:54]

This tells devil where to find local build products (e.g. the forwarder).

[nednguyen, 2017/01/20 16:08:50]

It either already be done in
https://github.com/catapult-project/catapult/blob/master/telemetry/telemetry/...
or the devil config should be merged to those default configs used by Telemetry

+        break