Add getParent() method for easier migration

Summary:
External partners have asked us to provide an easier way to migrate and this was
a breaking change in the most recent release.

Reviewed By: emilsjolander

Differential Revision: D7654526

fbshipit-source-id: efe44807caa97f495c5e5691dedcf281760fa23e

java/com/facebook/yoga/YogaNode.java

@@ -239,6 +239,13 @@ public class YogaNode implements Cloneable {
     return mOwner;
   }
 
+  /** @deprecated Use #getOwner() instead. This will be removed in the next version. */
+  @Deprecated
+  @Nullable
+  YogaNode getParent() {
+    return getOwner();
+  }
+
   public int indexOf(YogaNode child) {
     return mChildren == null ? -1 : mChildren.indexOf(child);
   }