Initial parser changes for the new directive syntax

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

Index: compiler/java/com/google/dart/compiler/ast/ASTVisitor.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/ASTVisitor.java	(revision 10597)
+++ compiler/java/com/google/dart/compiler/ast/ASTVisitor.java	(working copy)
@@ -265,6 +265,10 @@
     return visitExpression(node);
   }
 
+  public R visitPartOfDirective(DartPartOfDirective node) {
+    return visitDirective(node);
+  }
+
   public R visitPropertyAccess(DartPropertyAccess node) {
     return visitExpression(node);
   }