port polymer - 00e2982c78fcd396adaebff3118e94029a2b9fb0

pkg/polymer/lib/src/loader.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of polymer;
 
 /** Annotation used to automatically register polymer elements. */
 class CustomTag {
   final String tagName;
   const CustomTag(this.tagName);
@@ skipping 30 matching lines @@
 }
 
 /**
  * Same as [initPolymer], but runs the version that is optimized for deployment
  * to the internet. The biggest difference is it omits the [Zone] that
  * automatically invokes [Observable.dirtyCheck], and the list of libraries must
  * be supplied instead of being dynamically searched for at runtime.
  */
 // 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());
 }
 
 /**
  * Configures [initPolymer] making it optimized for deployment to the internet.
  * With this setup the list of libraries to initialize is supplied instead of
  * being dynamically searched for at runtime. Additionally, after this method is
  * called, [initPolymer] omits the [Zone] that automatically invokes
  * [Observable.dirtyCheck].
  */
 void configureForDeployment(List<String> libraries) {
@@ skipping 16 matching lines @@
 void _loadLibraries() {
   for (var lib in _librariesToLoad) {
     try {
       _loadLibrary(lib);
     } catch (e, s) {
       // Deliver errors async, so if a single library fails it doesn't prevent
       // other things from loading.
       new Completer().completeError(e, s);
     }
   }
-
-  customElementsReady.then((_) => Polymer._ready.complete());
 }
 
 /**
  * Walks the HTML import structure to discover all script tags that are
  * implicitly loaded. This code is only used in Dartium and should only be
  * called after all HTML imports are resolved. Polymer ensures this by asking
  * users to put their Dart script tags after all HTML imports (this is checked
  * by the linter, and Dartium will otherwise show an error message).
  */
 List<String> _discoverScripts(Document doc, String baseUri,
@@ skipping 151 matching lines @@
     print("warning: methods marked with @initMethod should take no "
         "arguments, ${method.simpleName} expects some.");
     return;
   }
   obj.invoke(method.simpleName, const []);
 }
 
 class _InitMethodAnnotation {
   const _InitMethodAnnotation();
 }