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Denis Koroskin 05544f6bca Make FlatUIImplementation.measure() work with virtual views (shadow nodes that don't map to a View)

Summary: UIImplementation.measure() can only measure shadow nodes that map to native Views. As a result of this, every time we tried to measure a shadow node that doesn't map to a View, we trigger callback with no data (to indicate an error). To fix this issue, walk up until we find a node that maps to a View, then measure that View and adjust for the bounds of a virtual child.

Reviewed By: ahmedre

Differential Revision: D2800960

2016-12-19 13:40:19 -08:00