Start sending parent id

Summary: Since subtree update is effectively a frame dump its a lot easier to send the parent ID. This will save having figure it out on the client which is somewhat expensive and is needed for bloks

Reviewed By: lblasa

Differential Revision: D45048023

fbshipit-source-id: 90c4888df063de0aa69c9b93c86d9891e30becbe

android/src/main/java/com/facebook/flipper/plugins/uidebugger/model/Node.kt

@@ -12,6 +12,7 @@ import com.facebook.flipper.plugins.uidebugger.descriptors.Id
 @kotlinx.serialization.Serializable
 data class Node(
     val id: Id,
+    val parent: Id?,
     val qualifiedName: String,
     val name: String,
     val attributes: Map<MetadataId, InspectableObject>,

android/src/main/java/com/facebook/flipper/plugins/uidebugger/traversal/PartialLayoutTraversal.kt

@@ -36,13 +36,14 @@ class PartialLayoutTraversal(
     val visited = mutableListOf<MaybeDeferred<Node>>()
     val observableRoots = mutableListOf<Any>()
 
-    val stack = mutableListOf<Any>()
-    stack.add(root)
+    // cur and parent Id
+    val stack = mutableListOf<Pair<Any, Id?>>()
+    stack.add(Pair(root, null))
 
     val shallow = mutableSetOf<Any>()
 
     while (stack.isNotEmpty()) {
-      val node = stack.removeLast()
+      val (node, parentId) = stack.removeLast()
 
       try {
         // If we encounter a node that has it own observer, don't traverse
@@ -53,11 +54,13 @@ class PartialLayoutTraversal(
 
         val descriptor = descriptorRegister.descriptorForClassUnsafe(node::class.java).asAny()
 
+        val curId = descriptor.getId(node)
         if (shallow.contains(node)) {
           visited.add(
               Immediate(
                   Node(
-                      descriptor.getId(node),
+                      curId,
+                      parentId,
                       descriptor.getQualifiedName(node),
                       descriptor.getName(node),
                       emptyMap(),
@@ -86,7 +89,7 @@ class PartialLayoutTraversal(
         children.forEach { child ->
           val childDescriptor = descriptorRegister.descriptorForClassUnsafe(child.javaClass)
           childrenIds.add(childDescriptor.getId(child))
-          stack.add(child)
+          stack.add(Pair(child, curId))
           // If there is an active child then don't traverse it
           if (activeChild != null && activeChild != child) {
             shallow.add(child)
@@ -99,7 +102,8 @@ class PartialLayoutTraversal(
         visited.add(
             attributes.map { attrs ->
               Node(
-                  descriptor.getId(node),
+                  curId,
+                  parentId,
                   descriptor.getQualifiedName(node),
                   descriptor.getName(node),
                   attrs,