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Currently does font size and line height.

Color is next. And there is still plumbing required to ensure more
controls/dialogs have access to views::style (and stop using
SetFontList). This CL establishes a core requirement to let us iterate
on layout for specific dialogs.

Example screenshots at https://crbug.com/691891#c10

BUG=691891

Review-Url: https://codereview.chromium.org/2765883004
Cr-Commit-Position: refs/heads/master@{#462676}