@djg @emilio
style: Extract {animated,computed}::Color common parts.
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5f74a15 
Extract the common parts of `animated::Color` and `computed::Color` out
into `generics::color::Color<T>` that is generic over the type of
RGBA color.

Bug: 1465307
Reviewed-by: xidorn
MozReview-Commit-ID: EymSr7aqnAP