GitLab

It's not uncommon to get an event fired on a View whose ancestor Window
is invisible, so it's not actually in a reachable part of the
accessibility tree. Suppress sending events in those cases (but still
serialize tree changes to be safe).

This eliminates a lot of harmless but annoying warnings from
automation_node.js like
"Got locationChanged event on unknown node: 10; this: 311"

Bug: none
Change-Id: I4cc127f74d57953c9a4f6b5ecd44902a368730ca
Reviewed-on: https://chromium-review.googlesource.com/1225950
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592995}