GitLab

This works by starting the drag on the first dwell
and ending the drag on the second dwell, and rewriting
mouse moved events to mouse dragged events in between.

This is still hidden behind the accessibility flag.

Bug: 894907
Change-Id: Ia2cd72053e3d1023711764e2b581caa686f2fb98
Reviewed-on: https://chromium-review.googlesource.com/c/1295250
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602512}