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Fix for AXRange::GetScreenRects to not return bounding boxes for ranges
that are offscreen.
Previously, we assumed ranges that are offscreen will have empty
bounding rects, this is incorrect because offscreen rects has its
width/height clipped to 1 rather than 0; so bounding box is not empty.
See doc:
https://cs.chromium.org/chromium/src/docs/accessibility/offscreen.md

Instead, GetScreenRects now looks at the offscreen status from the
bounds API to ignore offscreen ranges.

This fix is one of a series of fixes need for bug:964078.

Bug: 964078
Change-Id: Ibfb4d245845b7e18d59724b8c7fd09f9cc3de793
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824061
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#702893}