Adds parser recovery for type parameters and type arguments

compiler/java/com/google/dart/compiler/ast/DartSyntheticErrorIdentifier.java

Index: compiler/java/com/google/dart/compiler/ast/DartSyntheticErrorIdentifier.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartSyntheticErrorIdentifier.java b/compiler/java/com/google/dart/compiler/ast/DartSyntheticErrorIdentifier.java
new file mode 100644
index 0000000000000000000000000000000000000000..2e7e96c533a0b13d7ffd9320c037a6860c9d72a6
--- /dev/null
+++ b/compiler/java/com/google/dart/compiler/ast/DartSyntheticErrorIdentifier.java
@@ -0,0 +1,32 @@
+// 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.ast;
+
+/**
+ * This node is created by the parser when it cannot find a proper identifier token in the input
+ * stream.  The token might not have been consumed, or was a reserved word, so the name of the
+ * identifier is left blank.
+ */
+public class DartSyntheticErrorIdentifier extends DartIdentifier {
+
+  private final String tokenString;
+
+  public DartSyntheticErrorIdentifier() {
+    super("");
+    this.tokenString = "";
+  }
+
+  @Override
+  public <R> R accept(ASTVisitor<R> visitor) {
+    return visitor.visitSyntheticErrorIdentifier(this);
+  }
+
+  public String getTokenString() {
+    return tokenString;
+  }
+
+  @Override
+  public void visitChildren(ASTVisitor<?> visitor) {
+  }
+}