Summary:
The integration with Yoga was pretty complex from day one. The first attempt to make it simpler was in D19963353 when we removed a bunch of layers of indirection. This is the second iteration that aimed to simplify the structure of methods and their responsibilities.
The only conceptual change (that I am aware of) in this diff is that now we don't support (imaginary) case where a non-leaf YogaLayoutableShadowNode can have a non-YogaLayoutableShadowNode child. In the previous version, it was a no-op, now it's not supported and an assert will fire.
Alongside with refactoring, this diff implements several helper functions that verify the invariants important for the Concurrent Layout in debug mode.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: JoshuaGross
Differential Revision: D21198222
fbshipit-source-id: cc085904948056f861562af5bd2571de45a743b9
78b1c85747