Kartikaya Gupta 5da102e5d4 Bug 1384181 - Build WebRenderLayerScrollData instances for remote layer trees. r=jrmuizel
This adds handling for nsDisplayRemote frames, so that we create a
WebRenderLayerScrollData item for each nsDisplayRemote frame that we
encounter. This is the equivalent of a "ref layer" in a normal layer
tree, and allows the APZ side to glue together the scroll data from
different processes into a full tree.

MozReview-Commit-ID: 3lgsqtCKQya

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extra : rebase_source : eb93be1ef415349e00c09d7274d49fcf7992d197
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