Fix various parser bugs related to modifiers of top-level and class members.

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

Index: dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart b/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
index ab20f515cf11ca9c92146a1008fa45bd29b130b0..314e8d735a912df3750114e4b6e9d5c4ddcf5107 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
@@ -595,6 +595,22 @@ class Listener {
   void error(String message, Token token) {
     throw new ParserError("$message @ ${token.charOffset}");
   }
+
+  void reportError(Spannable spannable,
+                   MessageKind errorCode,
+                   [Map arguments = const {}]) {
+    String message = errorCode.error(arguments, true).toString();
+    Token token;
+    Node node;
+    if (spannable is Token) {
+      token = spannable;
+    } else if (spannable is Node) {
+      node = spannable;
+    } else {
+      throw new ParserError(message);
+    }
+    recoverableError(message, token: token, node: node);
+  }
 }
 
 class ParserError {
@@ -1122,6 +1138,12 @@ class ElementListener extends Listener {
     }
     pushNode(accumulator);
   }
+
+  void reportError(Spannable spannable,
+                   MessageKind errorCode,
+                   [Map arguments = const {}]) {
+    listener.reportError(spannable, errorCode, arguments);
+  }
 }
 
 class NodeListener extends ElementListener {