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Breakup GetAuraColor() to Make Control Flow Obvious

This change moves long switch statements into separate helper functions
to make it easier to see GetAuraColor's control flow.

BUG=

Change-Id: I203ee8dc54020e4ce60924511363a5cb19269e26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108821
Commit-Queue: Robert Liao <robliao@chromium.org>
Auto-Submit: Robert Liao <robliao@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751721}