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Now both render-subtree: skip-viewport-activation and skip-activation
subtrees are not in the AX subtree at all, as discussed in
https://github.com/WICG/display-locking/issues/102#issuecomment-564205445

Now only render-subtree:invisible subtrees are in the AX tree, and they
are automatically marked as offscreen because the nodes are activated
when they are on screen.

Bug: 1001930
Change-Id: I1de511672f60078a02b3ddf3d989f2da1c44ae9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028883Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740531}