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This change hooks into AXTextUtils::GetWordBoundariesForString and
exposes this information in automation.

Bug: 948700
Change-Id: I8fe5852cf1ce5e1eeb02e986d4524d44095d054f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642390Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668972}