Add support for setChildren

Summary: This adds support for UIManager.setChildren on Android like D2757388 added for iOS.

Reviewed By: andreicoman11

Differential Revision: D3235369

fb-gh-sync-id: b538556ec4abdb606f9be26d1b74734046bca0cd
fbshipit-source-id: b538556ec4abdb606f9be26d1b74734046bca0cd

ReactAndroid/src/main/java/com/facebook/react/uimanager/NativeViewHierarchyOptimizer.java

@@ -14,6 +14,7 @@ import javax.annotation.Nullable;
 import android.util.SparseBooleanArray;
 
 import com.facebook.infer.annotation.Assertions;
+import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.bridge.ReadableMapKeySetIterator;
 
 /**
@@ -171,6 +172,27 @@ public class NativeViewHierarchyOptimizer {
     }
   }
 
+  /**
+   * Handles a setChildren call.  This is a simplification of handleManagerChildren that only adds
+   * children in index order of the childrenTags array
+   */
+  public void handleSetChildren(
+    ReactShadowNode nodeToManage,
+    ReadableArray childrenTags
+  ) {
+    if (!ENABLED) {
+      mUIViewOperationQueue.enqueueSetChildren(
+        nodeToManage.getReactTag(),
+        childrenTags);
+      return;
+    }
+
+    for (int i = 0; i < childrenTags.size(); i++) {
+      ReactShadowNode nodeToAdd = mShadowNodeRegistry.getNode(childrenTags.getInt(i));
+      addNodeToNode(nodeToManage, nodeToAdd, i);
+    }
+  }
+
   /**
    * Handles an updateLayout call. All updateLayout calls are collected and dispatched at the end
    * of a batch because updateLayout calls to layout-only nodes can necessitate multiple