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The text insertion caret in web contents can have a positive height but
zero width. Ensure the a11y highlight is still visible in this case.

This regressed in:
https://chromium-review.googlesource.com/c/chromium/src/+/1152373

due to the change to AccessibilityHighlightController::IsCaretVisible.

Bug: 882762
Test: added to ash_unittests
Change-Id: I2743cb234b49eb5c0d71ba5bf1d25e3869c2492f
Reviewed-on: https://chromium-review.googlesource.com/1241215Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593681}