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When a frame is hidden, replace its accessibility tree with just the root,
and suppress all accessibility events in that tree while it's hidden.
By keeping the root in the tree, this allows us to propagate the change
to the browser process and free up resources there too.

The goal is that having lots of tabs open shouldn't significantly impact
your experience.

It may add a slight delay when switching to a tab.

Bug: 854411
Change-Id: I78b45e8f5772f0c9745ee59952f27f6ba3557bbc
Reviewed-on: https://chromium-review.googlesource.com/1107207
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569422}