I think the reason we originally didn't do this is that the
"isRunningOnCompositor" status might be misleading for animations that are
being overridden. That is, there are some animations we don't send to the
compositor because they are being overridden by another animation (e.g. a
CSS animation touching the 'transform' animation will cause a CSS transition
on the same property not to run, despite the fact that transitions apply
higher in the cascade). This is not merely a performance optimization but means
we don't have to do the cascade on the compositor.
In the future, once we introduce additive animation, we won't be able to handle
this so simply since it an animation will be able to be partially overridden.
Instead, consumers of this API will need to look at the 'composite' member of
the various animation values to see if an animation is being fully or partially
overridden.
As a result, this API really should return all running animations, even if they
are currently being overridden.
MozReview-Commit-ID: DwmbXdCqF32
--HG--
extra : rebase_source : 14e5412015b6c2c7ec6b7e105d414a89fc746c77
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