port polymer - 00e2982c78fcd396adaebff3118e94029a2b9fb0

pkg/polymer/lib/src/loader.dart

Index: pkg/polymer/lib/src/loader.dart
diff --git a/pkg/polymer/lib/src/loader.dart b/pkg/polymer/lib/src/loader.dart
index 9681a930519b2f48c7a2ff2f917892c9844abd1d..31661fc2f4e0a0f8843ca3c6c50948daa0278588 100644
--- a/pkg/polymer/lib/src/loader.dart
+++ b/pkg/polymer/lib/src/loader.dart
@@ -48,11 +48,14 @@ void initPolymer() {
  */
 // TODO(jmesserly): change the Polymer build step to call this directly.
 void _initPolymerOptimized() {
-  preventFlashOfUnstyledContent();
-
   document.register(PolymerDeclaration._TAG, PolymerDeclaration);
 
   _loadLibraries();
+
+  // Run this after user code so they can add to Polymer.veiledElements
+  _preventFlashOfUnstyledContent();
+
+  customElementsReady.then((_) => Polymer._ready.complete());
 }
 
 /**
@@ -89,8 +92,6 @@ void _loadLibraries() {
       new Completer().completeError(e, s);
     }
   }
-
-  customElementsReady.then((_) => Polymer._ready.complete());
 }
 
 /**