GitLab

Do not create AXObjects for head, style and script subtrees unless
known to be visible (and we don't know that if it's display locked, so
in that case we assume those subtrees shouldn't be created).

Bug: None
Change-Id: I86649a346d0ffaa1ca402c7076e7ccfe197600c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633925
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845247}