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When the progress is 100%, the result from the original formula of calculating `left_weight` may not be 0 exactly (i.e. approximate zero, e.g. -2.22e-16), and so this imprecision makes the recomposed Matrix3D have some approximate zeros. Those approximate zeros (e.g. `_m13` is 2e-16, and `_m23` is 8e-17 in WPT) make us failed to treat this Matrix3D as a 2D matrix when we serializing it (because we use `!= 0.0f` to check if the matrix components are not equal to zero in `Matrix4x4::Is2D()`, and other places). Differential Revision: https://phabricator.services.mozilla.com/D187814