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They are currently all gfx::kPlaceholderColor (red), but will be changed
in following CLs.

Bug: 939811
Change-Id: Ie1a8d2ba23b2cac84095eb5897a43be8db7392a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827430
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701733}