GitLab

Allow extended mouse buttons to be injected via the automation code.

BUG=680741

Change-Id: I2a9936e813abf9e5d0d5d3ee6dc98d44477f47f5
Reviewed-on: https://chromium-review.googlesource.com/986469
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547771}