Support metadata on patches.

pkg/compiler/lib/src/native/enqueue.dart

 // Copyright (c) 2014, 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 native;
 
 /**
  * This could be an abstract class but we use it as a stub for the dart_backend.
  */
 class NativeEnqueuer {
@@ skipping 296 matching lines @@
     _annotationCreatesClass = find('Creates');
     _annotationReturnsClass = find('Returns');
     _annotationJsNameClass = find('JSName');
   }
 
   /// Returns the JSName annotation string or `null` if no JSName annotation is
   /// present.
   String findJsNameFromAnnotation(Element element) {
     String name = null;
     ClassElement annotationClass = annotationJsNameClass;
-    for (Link<MetadataAnnotation> link = element.metadata;
-         !link.isEmpty;
-         link = link.tail) {
-      MetadataAnnotation annotation = link.head.ensureResolved(compiler);
+    for (MetadataAnnotation annotation in element.implementation.metadata) {
+      annotation.ensureResolved(compiler);
       ConstantValue value =
           compiler.constants.getConstantValue(annotation.constant);
       if (!value.isConstructedObject) continue;
       ConstructedConstantValue constructedObject = value;
       if (constructedObject.type.element != annotationClass) continue;
 
       Iterable<ConstantValue> fields = constructedObject.fields.values;
       // TODO(sra): Better validation of the constant.
       if (fields.length != 1 || fields.single is! StringConstantValue) {
         PartialMetadataAnnotation partial = annotation;
@@ skipping 357 matching lines @@
         superclass,
         () => <ClassElement>[]);
     directSubtypes.add(cls);
   }
 
   void logSummary(log(message)) {
     log('Compiled ${registeredClasses.length} native classes, '
         '${unusedClasses.length} native classes omitted.');
   }
 }