KeyframeEffectReadOnly::CanAnimatePropertyOnCompositor has a comment that says
it, "Returns true |aProperty| can be run on compositor for |aFrame|" but it
does nothing of the sort.
What it *does* do is check answer the question, "If there happened to be an
animation of |aProperty| on |aFrame|, should we still run animations on the
compositor for this element?".
This patch renames the method accordingly and moves the step where we iterate
over a given effect's animated properties from
AnimationCollection::CanPerformOnCompositor to inside this method, making this
method a class method rather than a static method at the same time.
As noted in the expanded comment, the approach of blocking opacity animations
in these situations seems unnecessary but for now this patch just preserves the
existing behavior.
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