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The color for the shelf notification badges is calculated by getting a
light vibrant color from the shelf app icon image. If no color can be
calculated then white is used as the default notification color.

Bug: 1080827
Change-Id: I2b858b7c15f1a54191afe063716c64a9fa58b925
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2241291
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796037}