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Most answers and entities have single line descriptions, but dictionary
definitions are allowed to wrap. This CL allows for that wrapping.

Also, fixes bug where the cached font_height_ wasn't updated properly.
(Which would occasionally cause a line to be too tall).

Bug: 838733
Change-Id: Ic1478acd6c62420f3bfd426b206973590b625729
Reviewed-on: https://chromium-review.googlesource.com/1048865Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557264}