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Summary: `ShadowNodeFragment` is very cheap by design because it does not own stuff it contains, so it's great. But... sometimes we need to own the stuff (e.g. to pass it on the other thread), in those cases we can use `ShadowNodeFragment::Value` now. `ShadowNodeFragment::Value` cannot be used alone, it needs to be constructed from `ShadowNodeFragment` and then used as opaque object and then it can be converted to ``ShadowNodeFragment`. We will need it soon. Reviewed By: mdvacca Differential Revision: D15039136 fbshipit-source-id: d40875cac05f4088358d8d418007d17df9ff14f4