Per the touch-action spec, the effective touch-action on an element includes
touch-action restrictions from ancestor elements up to and including the
element that has the "default action". This patch implements that behaviour
so that WebRender gets correct touch-action values on its display items.

MozReview-Commit-ID: Cw5uqAsE9qm

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extra : rebase_source : ef6e24a66385e097d50b3a03c06091464b1bb5b9