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This updates MdTextButton to draw 32dips high and with 4dip corner
radii when refresh is on. Also updates LayoutProvider::
GetControlHeightForFont even though it's not used by MdTextButton, to
avoid the two getting out of sync. Also moves empahsis methods to
LayoutProvider so that general views code can access them.

Bug: 822073
Change-Id: Ia3038ccafdddd79ca42837dc1de4f726894377e2
Reviewed-on: https://chromium-review.googlesource.com/1031551
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555614}