GitLab

Add a rAF before starting the test. My guess is that on slow bots
the the gesture starts before the layers are initialized and pushed
to the compositor's acive tree so the entire gesture gets ignored.

Bug: 836623
Change-Id: I1c54e31b4fb064926d8ad94da4bb8d9751332067
Reviewed-on: https://chromium-review.googlesource.com/1034010Reviewed-by: Steve Kobes <skobes@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554761}