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This is a reland of 74b8ec6f

Original change's description:
> [Empties] Enable the IllustratedEmptyStates field trial testing config.
> 
> Change-Id: I664fa63b5b69369cb69fb4b87463ba3bb4cfc94d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386295
> Reviewed-by: Sergio Collazos <sczs@chromium.org>
> Reviewed-by: Steven Holte <holte@chromium.org>
> Commit-Queue: sebsg <sebsg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805136}

Change-Id: Ieb3e461efb4c55e7ef601417819cc4470e8fe4cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401398
Commit-Queue: sebsg <sebsg@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Auto-Submit: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807867}