Support for (de)serializing node state (#1570)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1570

X-link: https://github.com/facebook/react-native/pull/42751

tsia. Need node state

Changelog: [Internal]

Reviewed By: NickGerleman

Differential Revision: D53206323

fbshipit-source-id: eb48c3873536eb52c8ffcce8005725da274e5373

yoga/YGNode.cpp

@@ -329,6 +329,10 @@ void YGNodeSetAlwaysFormsContainingBlock(
   resolveRef(node)->setAlwaysFormsContainingBlock(alwaysFormsContainingBlock);
 }
 
+bool YGNodeGetAlwaysFormsContainingBlock(YGNodeConstRef node) {
+  return resolveRef(node)->alwaysFormsContainingBlock();
+}
+
 // TODO: This leaks internal details to the public API. Remove after removing
 // ComponentKit usage of it.
 bool YGNodeCanUseCachedMeasurement(

yoga/YGNode.h

@@ -273,6 +273,14 @@ YG_EXPORT void YGNodeSetAlwaysFormsContainingBlock(
     YGNodeRef node,
     bool alwaysFormsContainingBlock);
 
+/**
+ * Whether the node will always form a containing block for any descendant. This
+ * can happen in situation where the client implements something like a
+ * transform that can affect containing blocks but is not handled by Yoga
+ * directly.
+ */
+YG_EXPORT bool YGNodeGetAlwaysFormsContainingBlock(YGNodeConstRef node);
+
 /**
  * @deprecated
  */