Overhaul RenderNode's DisplayList management
* Move mValid to native
* Have destroyHardwareResources destroy everything
* Remove flaky mParentCount checks in setStaging
* All tree updates have an internal observer to
ensure onRemovedFromTree() is a reliable signal
* onRemovedFromTree() immediately releases resources
to avoid displaylist "leaks"
Test: Unit tests for validity added & pass, manually
verified that b/
34072929 doesn't repro
Bug:
34072929
Change-Id: I856534b4ed1b7f009fc4b7cd13209b97fa42a71c
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