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Valentin SherginandFacebook Github Bot
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Summary: This diff introduces RCTComponentViewDescriptor - the container for a view and associated with this view properties which mounting infra uses for bookkeeping (and recycling) views. The previous implementation used raw Objective-C pointers to `UIView`s to store and manipulate them. The new way has a bunch of advantages: * It allows using high-performant C++ data collections for storing views and their properties (in future diffs). * The new approach allows us to avoid hacks around NSMapTable (such as ` [_registry setObject:componentView forKey:(__bridge id)(void *)tag];`) that were needed because NSMapTable wasn't designed for our use-case. * Dealing with `RCTComponentViewDescriptor` which stores a pointer to a view sometimes is actually more efficient than dealing with those pointers themselfs because we can deal with `const &` to a descriptor which does not require a ref-counter bump. * A new approach is much more flexible, it allows us to store additional data alongside view instances which we will use in coming diffs. Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D18217102 fbshipit-source-id: 063e6c7df794a2e1fd690c194fb31ad6833eaba7