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This CL adds two new methods to the KaleidoscopeDataProvider API which
allow the page to query whether or not to show the first run experience
and to tell the browser when first run is successfully completed.

Bug: b:154517281
Change-Id: I18bafb0239b86384e42d45078b2184d8ed5d911b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354460Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798368}