Dark mode: colors for sync error states

Bug: 915465
Change-Id: I2712459903140725c2c75dfdf0026013961ea964
Reviewed-on: https://chromium-review.googlesource.com/c/1391952
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629148}
4 files changed