Wait until draw is defined in webrtc.webrtc_smoothness_tbmv2

tools/perf/page_sets/webrtc_cases.py

Index: tools/perf/page_sets/webrtc_cases.py
diff --git a/tools/perf/page_sets/webrtc_cases.py b/tools/perf/page_sets/webrtc_cases.py
index 41427d81fede5c5f6da3672ccdbe8379910e5b80..eb6de3e6436727e826f19a70cc8a4f82e5c7d9c4 100644
--- a/tools/perf/page_sets/webrtc_cases.py
+++ b/tools/perf/page_sets/webrtc_cases.py
@@ -149,6 +149,7 @@ class Page8(WebrtcPage):
   def RunPageInteractions(self, action_runner):
     with action_runner.CreateInteraction('Action_Canvas_PeerConnection',
                                          repeatable=False):
+      action_runner.Wait(10)

[nednguyen, 2017/03/16 16:12:35]

Please wait for until the draw command is defined instead. Don't just add 10s
wait like this because it bumps up the timing across all the machines.

       action_runner.ExecuteJavaScript('draw();')
       action_runner.ExecuteJavaScript('doCanvasCaptureAndPeerConnection();')
       action_runner.Wait(10)