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Tiles with missing/small favicons will display fallback icons instead, which consists of a colored circle and the first letter of the tile title. The fallback color will either be gray for missing favicons or the dominant color of the small favicon.

This change depends on https://crrev.com/c/1096670.

Screenshot: https://screenshot.googleplex.com/dbu8dxk97sX.png

Bug: 837798
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Ie6ddf538396bcf8fbfd11cb9e9f0bad075301edd
Reviewed-on: https://chromium-review.googlesource.com/1096680
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567493}