Add overlays back to stocks2.

Except that nothing actually uses these now so it's a no-op really.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1157243011

examples/stocks2/lib/stock_app.dart

@@ -191,7 +191,7 @@ class StocksApp extends App {
     //   _searchBarStyle);
   }
 
-  // void addMenuToOverlays(List<UINode> overlays) {
+  void addMenuToOverlays(List<UINode> overlays) {
     // if (_menuController == null)
     //   return;
     // overlays.add(new ModalOverlay(
@@ -201,20 +201,22 @@ class StocksApp extends App {
     //     onAutorefreshChanged: _handleAutorefreshChanged
     //   )],
     //   onDismiss: _handleMenuHide));
-  // }
+  }
 
   UINode build() {
-    // List<UINode> overlays = [];
-    // addMenuToOverlays(overlays);
-    return new Scaffold(
+    List<UINode> overlays = [
+      new Scaffold(
         toolbar: _isSearching ? buildSearchBar() : buildToolBar()
         // ,
         // body: new Stocklist(stocks: _stocks, query: _searchQuery),
         // floatingActionButton: new FloatingActionButton(
-    //     content: new Icon(type: 'content/add_white', size: 24), level: 3),
-    //   drawer: _drawerShowing ? buildDrawer() : null,
-    //   overlays: overlays
-    );
+        //   content: new Icon(type: 'content/add_white', size: 24),
+        //   level: 3),
+        // drawer: _drawerShowing ? buildDrawer() : null
+      ),
+    ];
+    addMenuToOverlays(overlays);
+    return new StackContainer(children: overlays);
   }
 }