Add support for metadata annotation syntax (issue 4056)

compiler/java/com/google/dart/compiler/parser/DartParserCommentsHelper.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.parser;
 
 import com.google.common.collect.Lists;
 import com.google.dart.compiler.DartCompilerListener;
 import com.google.dart.compiler.Source;
 import com.google.dart.compiler.ast.ASTVisitor;
@@ skipping 131 matching lines @@
             // something other than declaration
             break;
           }
         }
         // apply comment to declaration
         if (decl != null) {
           String commentStr = sourceCode.substring(comment.getSourceInfo().getOffset(),
               comment.getSourceInfo().getEnd());
           // may be @Metadata
           if (commentStr.contains("@deprecated")) {
-            decl.setMetadata(decl.getMetadata().makeDeprecated());
+            decl.setObsoleteMetadata(decl.getObsoleteMetadata().makeDeprecated());
           }
           if (commentStr.contains("@override")) {
-            decl.setMetadata(decl.getMetadata().makeOverride());
+            decl.setObsoleteMetadata(decl.getObsoleteMetadata().makeOverride());
           }
           // DartDoc
           if (comment.isDartDoc()) {
             decl.setDartDoc(comment);
           }
         }
       }
     }
   }
 
@@ skipping 58 matching lines @@
     boolean hasMore1 = commentStart + 1 < sourceString.length();
     boolean hasMore2 = commentStart + 2 < sourceString.length();
     if (hasMore1 && sourceString.charAt(commentStart + 1) == '/') {
       return DartComment.Style.END_OF_LINE;
     } else if (hasMore2 && sourceString.charAt(commentStart + 2) == '*') {
       return DartComment.Style.DART_DOC;
     }
     return DartComment.Style.BLOCK;
   }
 }