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/UIManagerModule.java

@@ -231,6 +231,20 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
         removeFrom);
   }
 
+  /**
+   * Interface for fast tracking the initial adding of views.  Children view tags are assumed to be
+   * in order
+   *
+   * @param viewTag the view tag of the parent view
+   * @param childrenTags An array of tags to add to the parent in order
+   */
+  @ReactMethod
+  public void setChildren(
+    int viewTag,
+    ReadableArray childrenTags) {
+    mUIImplementation.setChildren(viewTag, childrenTags);
+  }
+
   /**
    * Replaces the View specified by oldTag with the View specified by newTag within oldTag's parent.
    * This resolves to a simple {@link #manageChildren} call, but React doesn't have enough info in