Introducing "collapsable" prop as part of ViewProps

Summary: This diff introduces the collapsable props in the viewProps. This prop is used in product code to prevent specific Views to be removed from the view hierarchy

Reviewed By: shergin

Differential Revision: D10254679

fbshipit-source-id: 637665b8998a86e29e839eb6d405a0fac354c8d3

ReactCommon/fabric/components/view/ViewProps.cpp

@@ -67,7 +67,12 @@ ViewProps::ViewProps(const ViewProps &sourceProps, const RawProps &rawProps)
       pointerEvents(
           convertRawProp(rawProps, "pointerEvents", sourceProps.pointerEvents)),
       hitSlop(convertRawProp(rawProps, "hitSlop", sourceProps.hitSlop)),
-      onLayout(convertRawProp(rawProps, "onLayout", sourceProps.onLayout)){};
+      onLayout(convertRawProp(rawProps, "onLayout", sourceProps.onLayout)),
+      collapsable(convertRawProp(
+          rawProps,
+          "collapsable",
+          sourceProps.collapsable,
+          true)){};
 
 #pragma mark - Convenience Methods
 

ReactCommon/fabric/components/view/ViewProps.h

@@ -58,6 +58,8 @@ class ViewProps : public Props,
   const EdgeInsets hitSlop{};
   const bool onLayout{};
 
+  const bool collapsable{true};
+
 #pragma mark - Convenience Methods
 
   BorderMetrics resolveBorderMetrics(bool isRTL) const;