Change ElementID to Element for Sidebar Extension

Summary: Element also contains `id`, which is equivalent to ElementID used in the existing extension. This change will help the implementation of layout intern search easier.

Reviewed By: mweststrate

Differential Revision: D21385001

fbshipit-source-id: b8c6e6f052af8cfa54bf3a132571e40567cdee4b

desktop/app/src/fb-stubs/LayoutInspectorSidebarExtensions.tsx

@@ -7,14 +7,14 @@
  * @format
  */
 
-import {PluginClient, Client, ElementID} from 'flipper';
+import {PluginClient, Client, Element} from 'flipper';
 import {Logger} from 'app/src/fb-interfaces/Logger';
 
 export default [] as Array<
   (
     client: PluginClient,
     realClient: Client,
-    selectedNode: ElementID,
+    selectedNode: Element,
     logger: Logger,
   ) => React.ReactNode
 >;

desktop/plugins/layout/InspectorSidebar.tsx

@@ -149,7 +149,7 @@ const Sidebar: React.FC<Props> = (props: Props) => {
   const sections: Array<React.ReactNode> = (
     (SidebarExtensions &&
       SidebarExtensions.map((ext) =>
-        ext(props.client, props.realClient, element.id, props.logger),
+        ext(props.client, props.realClient, element, props.logger),
       )) ||
     []
   ).concat(