Add devil dependencies config for performance tests.

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 a39dca9296f96f752656d81cfc99e676c39044e5..8192795fa3e9ab04a92d32a370275e9b930f2846 100644
--- a/tools/perf/chrome_telemetry_build/chromium_config.py
+++ b/tools/perf/chrome_telemetry_build/chromium_config.py
@@ -21,8 +21,11 @@ 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):
@@ -46,3 +49,9 @@ class ChromiumConfig(project_config.ProjectConfig):
     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