Add support for metadata annotation syntax (issue 4056)

compiler/java/com/google/dart/compiler/resolver/MemberBuilder.java

 // 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.
 
 package com.google.dart.compiler.resolver;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Objects;
 import com.google.dart.compiler.DartCompilerContext;
 import com.google.dart.compiler.ErrorCode;
@@ skipping 337 matching lines @@
         modifiers = modifiers.makeStatic();
         // Set the "const" modifier so that it is easy to compare a constant field to other
         // types of constant expressions.
         modifiers = modifiers.makeConstant();
       }
       if (fieldNode.getValue() != null) {
         modifiers = modifiers.makeInitialized();
       }
       FieldNodeElement fieldElement = fieldNode.getElement();
       if (fieldElement == null) {
-        fieldElement = Elements.fieldFromNode(fieldNode, currentHolder, fieldNode.getMetadata(),
+        fieldElement = Elements.fieldFromNode(fieldNode, currentHolder, fieldNode.getObsoleteMetadata(),
             modifiers);
         addField(currentHolder, fieldElement);
       } else {
         // This is a top-level element, and an element was already created in
         // TopLevelElementBuilder.
         Elements.addField(currentHolder, fieldElement);
         assertTopLevel(fieldNode);
       }
       fieldElement.setType(type);
       recordElement(fieldNode.getName(), fieldElement);
@@ skipping 63 matching lines @@
         element = topLevelContext.getScope().findElement(context.getScope().getLibrary(), name);
       }
 
       FieldElementImplementation fieldElement = null;
       if (element == null || element.getKind().equals(ElementKind.FIELD)
           && element.getModifiers().isAbstractField()) {
         fieldElement = (FieldElementImplementation) element;
       }
 
       if (fieldElement == null) {
-        fieldElement = Elements.fieldFromNode(fieldNode, currentHolder, fieldNode.getMetadata(),
+        fieldElement = Elements.fieldFromNode(fieldNode, currentHolder, fieldNode.getObsoleteMetadata(),
             fieldNode.getModifiers());
         addField(currentHolder, fieldElement);
       }
 
       if (accessorNode.getModifiers().isGetter()) {
         if (fieldElement.getGetter() != null) {
           if (!topLevelDefinition) {
             reportDuplicateDeclaration(ResolverErrorCode.DUPLICATE_MEMBER, fieldElement.getGetter());
             reportDuplicateDeclaration(ResolverErrorCode.DUPLICATE_MEMBER, accessorElement);
           }
@@ skipping 214 matching lines @@
      */
     private void reportDuplicateDeclaration(ErrorCode errorCode, Element element) {
       String name =
           element instanceof MethodElement
               ? Elements.getRawMethodName((MethodElement) element)
               : element.getName();
       resolutionError(element.getNameLocation(), errorCode, name);
     }
   }
 }