chromeos: disables event throttling in window-service clients

Only the window-service should throttle.

BUG=929914
TEST=none
TBR=sadrul@chromium.org

Change-Id: Iab7ea987c8fcb1f52b9c1e69576a0f950d790787
Reviewed-on: https://chromium-review.googlesource.com/c/1470941
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631868}
1 file changed