Function traverseAllChildren

code/new-context-api/public/app.js:18503–18509

* Traverses children that are typically specified as `props.children`, but * might also be specified through attributes: * * - `traverseAllChildren(this.props.children, ...)` * - `traverseAllChildren(this.props.leftPanelChildren, ...)` * * The `traverseContext` is an optional argument that is

(children, callback, traverseContext)

 * @return {!number} The number of children in this subtree.
 */
function traverseAllChildren(children, callback, traverseContext) {
  if (children == null) {
    return 0;
  }

  return traverseAllChildrenImpl(children, '', callback, traverseContext);
}

/**
 * Generate a key string that identifies a component within a set.