GitLab

Saves the option to show the internal accessibility tree as the
preference kShowInternalAccessibilityTree.

Change-Id: Ib16c93f982da3e3cae1728fb8cdb0747a7463549
Reviewed-on: https://chromium-review.googlesource.com/1144271
Commit-Queue: James Wallace-Lee <jamwalla@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577353}