Parse metadata, but ignore it.

dart/lib/compiler/implementation/scanner/listener.dart

Index: dart/lib/compiler/implementation/scanner/listener.dart
diff --git a/dart/lib/compiler/implementation/scanner/listener.dart b/dart/lib/compiler/implementation/scanner/listener.dart
index ad888baf8ea3c02db4b460170cb371c143059fc0..fb2e87c22cd3087a24896ce7cba5dd7e5571f08c 100644
--- a/dart/lib/compiler/implementation/scanner/listener.dart
+++ b/dart/lib/compiler/implementation/scanner/listener.dart
@@ -195,6 +195,12 @@ class Listener {
   void endMethod(Token getOrSet, Token beginToken, Token endToken) {
   }
 
+  void beginMetadata(Token token) {
+  }
+
+  void endMetadata(Token beginToken, Token endToken) {
+  }
+
   void beginOptionalFormalParameters(Token token) {
   }
 
@@ -575,6 +581,11 @@ class ElementListener extends Listener {
     addScriptTag(scriptTag);
   }
 
+  void endMetadata(Token beginToken, Token endToken) {
+    var send = popNode(); // Qualified (Send or Identifier).
+    // TODO(ahe): Don't discard metadata.
+  }
+
   void endClassDeclaration(int interfacesCount, Token beginToken,
                            Token extendsKeyword, Token implementsKeyword,
                            Token endToken) {