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New colored avatars use the following colors:
- Background color is equal to the frame color
- Stroke color depends on whether the background color is dark:
  * If the background color is dark, the stroke color is white
  * Otherwise, the stroke color is computed from the background color
    by decreasing the lightness by 0.5

Bug: 1100835
Change-Id: I40d77064cf4baef339c931211eb12153e2f6e0c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362592
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799467}