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8a9a12b10f
This patch refactors Effen in advance of allowing a final transform step from Effen nodes to sky nodes. The central changes here are:
1) Effen nodes get a _parentNode pointer
2) The lifetime of effen nodes is
->_sync (0 to N times)
-> the first _sync() causes a _mount()
->_unmount
3) Node should expect to sync even when they are first inserted (in which case they sync against a prototypical empty node which their class must provide).
4) Subclasses now override _syncNode() no longer takes host & insertBefore (_mount does). In the one case that a node must be replaced without being unmounted (inside _syncInternal), the old node is inspected for it's sky position.
TBR=abarth
Review URL: https://codereview.chromium.org/996103008