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This still has a couple of rough edges:
 * Some layouts lacking a keypad thousands separator will show a decimal
   separator at both NumpadDecimal and NumpadComma.
 * IntlBackslash will appear on layouts where it's not typically
   present (usually generating '<').
 * Japanese and Korean IME keys are not included even where applicable.
 * When the user modifies the enabled keyboard layouts or settings,
   several layout messages can end up being sent in rapid succession as
   the changes are applied.
 * Probably other things that will be revealed during testing.

Bug: 1026029
Change-Id: Icb511db3d3b5715ab563a0f433443c977e5c805c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063850
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744150}