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This WebUI is already present on other platforms. It will be useful for
testing upcoming refactoring of the suggestions component.

Change-Id: I303b02c04b0f90c34dd72bf0157199a60a26eb97
Reviewed-on: https://chromium-review.googlesource.com/574592Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488274}