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This is used to test asynchronous behaviors of touch in interactive
ui tests for ChromeOS, which also fits with the design of Mash.

See https://docs.google.com/document/d/1h6-dBGUUF2Us4C8ELzqlNyZx1VzcGlenLPDeOBJDJJw/edit?usp=sharing
for the details of the failure reason.

BUG=890071
TEST=tab_drag_controller_intearctive_uitest

Change-Id: I07a292e8f8cd69afa4212f90a52400d612cf6f63
Reviewed-on: https://chromium-review.googlesource.com/c/1309093Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604972}