Add webrtc.stress to whitelist.

BUG=chromium:651820
TEST=can't test, config change

Change-Id: Ie811095628ddba6a1fe3348c88534b51c73b072c
Reviewed-on: https://chromium-review.googlesource.com/411881
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Commit-Queue: Rohit Makasana <rohitbm@chromium.org>
Tested-by: Rohit Makasana <rohitbm@chromium.org>
diff --git a/server/cros/telemetry_runner.py b/server/cros/telemetry_runner.py
index 95ad5b5..69529fd 100644
--- a/server/cros/telemetry_runner.py
+++ b/server/cros/telemetry_runner.py
@@ -60,7 +60,8 @@
                      'startup.cold.blank_page',
                      'sunspider',
                      'tab_switching.top_10',
-                     'webrtc.peerconnection']
+                     'webrtc.peerconnection',
+                     'webrtc.stress']
 
 # BLACK LIST
 #  'session_restore.cold.typical_25', # profile generator not implemented on