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When two spans are separated by a line break, and the second span's text node
also begins with a line break, the space shown in the layout is not rendered
in the accessibility presentation.

The computation to determine if there is rendered space adjacent to a space-only
node must use the inline text boxes to get the most accurate representation
of what is ultimately rendered.

Bug: 821906
Change-Id: Ie81134a95a8878d22a370e97b330e0eae5101d67
Reviewed-on: https://chromium-review.googlesource.com/988375
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547589}