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Material Design tile titles are 15px high, but on some (if not all)
platforms the natural height of title content is 14px high. This creates
a click "dead zone" on the tile. This CL forces content height to be
100% to remove the dead zone.

BUG=459301

Review URL: https://codereview.chromium.org/938473002

Cr-Commit-Position: refs/heads/master@{#317633}