Added Set+Map to dev shell, even though we don't support deep inspecting them yet

shells/dev/app/InspectableElements/InspectableElements.js

@@ -4,6 +4,7 @@ import React, { Fragment } from 'react';
 import Contexts from './Contexts';
 import CustomHooks from './CustomHooks';
 import CustomObject from './CustomObject';
+import MapAndSet from './MapAndSet';
 import NestedProps from './NestedProps';
 import SimpleValues from './SimpleValues';
 
@@ -14,6 +15,7 @@ export default function InspectableElements() {
     <Fragment>
       <h1>Inspectable elements</h1>
       <SimpleValues />
+      <MapAndSet />
       <NestedProps />
       <Contexts />
       <CustomHooks />

shells/dev/app/InspectableElements/MapAndSet.js

@@ -0,0 +1,19 @@
+// @flow
+
+import React from 'react';
+
+const set = new Set();
+set.add('abc');
+set.add(123);
+
+const map = new Map();
+map.set('name', 'Brian');
+map.set('food', 'sushi');
+
+export default function MapAndSet() {
+  return <ChildComponent map={map} set={set} />;
+}
+
+function ChildComponent(props: any) {
+  return null;
+}