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This gets called a *lot* when fetching colors while painting which assumes it's cheap.

In fact, it's responsible for about 25% of paint time on Windows and ~6% on Mac (per profiling in the field).

Bug: 950063
Change-Id: I57905fffeb51b884a0e94bac28e10b05caacd180
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1565063Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654848}