Add @JSName annotation for native fields and methods.

sdk/lib/_internal/compiler/implementation/enqueue.dart

 // Copyright (c) 2012, 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 dart2js;
 
 class EnqueueTask extends CompilerTask {
   final Enqueuer codegen;
   final Enqueuer resolution;
 
@@ skipping 194 matching lines @@
       // the set contains any selector we have to assume that it matches.
       if (universe.hasInvocation(member, compiler)) {
         return addToWorkList(member);
       }
     } else if (member.kind == ElementKind.SETTER) {
       if (universe.hasInvokedSetter(member, compiler)) {
         return addToWorkList(member);
       }
     } else if (member.kind == ElementKind.FIELD &&
                member.enclosingElement.isNative()) {
+      nativeEnqueuer.registerField(member);
       if (universe.hasInvokedGetter(member, compiler) ||
           universe.hasInvocation(member, compiler)) {
         nativeEnqueuer.registerFieldLoad(member);
       }
       if (universe.hasInvokedSetter(member, compiler)) {
         nativeEnqueuer.registerFieldStore(member);
       }
     }
   }
 
@@ skipping 173 matching lines @@
 
   String toString() => 'Enqueuer($name)';
 
   void logSummary(log(message)) {
     log(isResolutionQueue
         ? 'Resolved ${resolvedElements.length} elements.'
         : 'Compiled ${universe.generatedCode.length} methods.');
     nativeEnqueuer.logSummary(log);
   }
 }