Handle UINodes being moved around the Effen tree.
Changes: - Remove all the old tracing logic since that was a lot of code for just random printf debugging and nobody seems to use it - Convert "defunct", a permanent state transition, to "mounted", a state that can be entered and exitted arbitrarily - Coallesce mount/unmount notifications so there's only one per frame - Remove handleRemoved() since we don't use it - Rename a local variable 'parent' to 'ancestor' to avoid shadowing the field - Replace uses of forEach() with for-in Effects: - Reusing a node provided to a constructor in a new place in a tree (especially at a different depth) no longer fails (it used to fail because the node would be marked defunct then remounted later, at which point it would fail) R=abarth@chromium.org Review URL: https://codereview.chromium.org/1169673002
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