Currently, we use the unit of the nsCSSValue to distinguish which backend we are using  in ProcessMatrixOperator. However, this is just a short-term solution and we don't like it, so it's better to add a backend flag for it.  http://searchfox.org/mozilla-central/rev/765cc1b925c5d32d05111c364257a0b79bf2952e/layout/style/nsStyleTransformMatrix.cpp#536
I wonder we don't use ProcessMatrixOperator if we use interpolation code in servo on the compositor.
status-firefox57: --- → wontfix
status-firefox58: --- → fix-optional
status-firefox58: fix-optional → wontfix
status-firefox59: --- → ?
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