Generic solution for live editing

Summary: Preparation for making components live editable

Reviewed By: kevin0571

Differential Revision: D16379961

fbshipit-source-id: d0ea3d753eb588fe7b55f2345124427b4a5a58b5

iOS/Plugins/FlipperKitLayoutPlugin/FlipperKitLayoutPlugin/SKNodeDescriptor.h

@@ -43,6 +43,12 @@ typedef void (^SKNodeUpdateData)(id value);
  */
 - (NSString *)identifierForNode:(T)node;
 
+/**
+  An ID which is equal between reflowing components is needed to get the identifier of root
+  node of a tree which need to be invalidated on FlipperKitLayoutPlugin side.
+*/
+- (NSString *)identifierForInvalidation:(T)node;
+
 /**
   The name used to identify this node in the Sonar desktop application. This is what
   will be visible in the hierarchy.