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We recently migrated to the NGOffsetMapping class to convert from DOM offsets, which might have uncompressed white-space, to text offsets
which are used in the accessibility tree.
However, the assumption was that NGOffsetMapping supports returning text offsets for
all block flow elements, which is untrue. Only block flow elements that are at inline or inline-block level are supported.
Unfortunately, allowing block-level elements through to the NGOffsetMapping class could cause a serious crash in Blink.

AX-Relnotes: n/a.

R=dmazzoni@chromium.org, aleventhal@chromium.org, yosin@chromium.org

Change-Id: I311be3cbc01abd8d1819c405bf7c63aaa62785d5
Bug: 1124963
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436748
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Auto-Submit: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811915}