Recognize "patch" identifier in .dartp files.

lib/compiler/implementation/elements/elements.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.
 
 #library('elements');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
 #import('../leg.dart');  // TODO(karlklose): we only need type.
 #import('../util/util.dart');
@@ skipping 84 matching lines @@
   static final ElementKind VOID =
     const ElementKind('void', ElementCategory.NONE);
 
   toString() => id;
 }
 
 class Element implements Hashable {
   final SourceString name;
   final ElementKind kind;
   final Element enclosingElement;
+  Link<Node> metadata = const EmptyLink<Node>();
   Modifiers get modifiers() => null;
 
   Node parseNode(DiagnosticListener listener) {
     listener.cancel("Internal Error: $this.parseNode", token: position());
   }
 
   Type computeType(Compiler compiler) {
     compiler.internalError("$this.computeType.", token: position());
   }
 
+  void addMetadata(Node node) {
+    metadata = metadata.prepend(node);
+  }
+
   bool isFunction() => kind === ElementKind.FUNCTION;
   bool isMember() =>
       enclosingElement !== null && enclosingElement.kind === ElementKind.CLASS;
   bool isInstanceMember() => false;
   bool isFactoryConstructor() => modifiers !== null && modifiers.isFactory();
   bool isGenerativeConstructor() => kind === ElementKind.GENERATIVE_CONSTRUCTOR;
   bool isGenerativeConstructorBody() =>
       kind === ElementKind.GENERATIVE_CONSTRUCTOR_BODY;
   bool isCompilationUnit() {
     return kind === ElementKind.COMPILATION_UNIT ||
@@ skipping 1011 matching lines @@
   final Node node;
   Type bound;
   Type type;
   TypeVariableElement(name, Element enclosing, this.node, this.type,
                       [this.bound])
     : super(name, ElementKind.TYPE_VARIABLE, enclosing);
   Type computeType(compiler) => type;
   Node parseNode(compiler) => node;
   toString() => "${enclosingElement.toString()}.${name.slowToString()}";
 }