Support for native in leg, and start moving native tests to a specific test suite.

frog/leg/elements/elements.dart

 // 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.
 
 #library('elements');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
 #import('../leg.dart');  // TODO(karlklose): we only need type.
 #import('../util/util.dart');
@@ skipping 597 matching lines @@
    * Returns the super class, if any.
    *
    * The returned element may not be resolved yet.
    */
   ClassElement get superclass() {
     assert(isResolved);
     return supertype === null ? null : supertype.element;
   }
 
   bool isInterface() => false;
+  bool isNative() => nativeName != null;
+  String nativeName;
 }
 
 class Elements {
   static bool isLocal(Element element) {
     return ((element !== null)
             && !element.isInstanceMember()
             && !isStaticOrTopLevelField(element)
             && !isStaticOrTopLevelFunction(element)
             && (element.kind === ElementKind.VARIABLE ||
                 element.kind === ElementKind.PARAMETER ||
@@ skipping 94 matching lines @@
   bool isContinueTarget = false;
 
   StatementElement(this.origin, Element enclosingElement)
       : super(const SourceString(""), ElementKind.STATEMENT, enclosingElement);
   StatementElement.label(String name, this.origin, Element enclosingElement)
       : super(new SourceString(name), ElementKind.STATEMENT, enclosingElement);
   bool get isTarget() => isBreakTarget || isContinueTarget;
 
   Node parseNode(DiagnosticListener l) => origin;
 }