Initial support for hide and show in import directives

compiler/java/com/google/dart/compiler/ast/ASTVisitor.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.ast;
 
 import java.util.List;
 
 /**
  * A visitor for abstract syntax tree.
@@ skipping 175 matching lines @@
   }
 
   public R visitIdentifier(DartIdentifier node) {
     return visitExpression(node);
   }
 
   public R visitIfStatement(DartIfStatement node) {
     return visitStatement(node);
   }
 
+  public R visitImportCombinator(ImportCombinator node) {
+    return visitNode(node);
+  } 
+
   public R visitImportDirective(DartImportDirective node) {
     return visitDirective(node);
   }
 
+  public R visitImportHideCombinator(ImportHideCombinator node) {
+    return visitImportCombinator(node);
+  } 
+
+  public R visitImportShowCombinator(ImportShowCombinator node) {
+    return visitImportCombinator(node);
+  } 
+
   public R visitInitializer(DartInitializer node) {
     return visitNode(node);
   }
 
   public R visitIntegerLiteral(DartIntegerLiteral node) {
     return visitLiteral(node);
   }
 
   public R visitLabel(DartLabel node) {
     return visitStatement(node);
@@ skipping 146 matching lines @@
   public R visitTypeParameter(DartTypeParameter node) {
     return visitDeclaration(node);
   }
 
   public R visitNativeBlock(DartNativeBlock node) {
     return visitBlock(node);
   }
 
   public R visitRedirectConstructorInvocation(DartRedirectConstructorInvocation node) {
     return visitInvocation(node);
-  } 
+  }
 }