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

frog/leg/scanner/scanner_task.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.
 
 class ScannerTask extends CompilerTask {
   ScannerTask(Compiler compiler) : super(compiler);
   String get name() => 'Scanner';
 
   void scan(CompilationUnitElement compilationUnit) {
     measure(() {
       scanElements(compilationUnit);
       if (compilationUnit.kind === ElementKind.LIBRARY) {
         processScriptTags(compilationUnit);
       }
+      native.processNativeClasses(compiler, compilationUnit);
     });
   }
 
   void processScriptTags(LibraryElement library) {
     LinkBuilder<ScriptTag> imports = new LinkBuilder<ScriptTag>();
     Uri cwd = new Uri(scheme: 'file', path: compiler.currentDirectory);
     Uri base = cwd.resolve(library.script.name.toString());
     for (ScriptTag tag in library.tags.reverse()) {
       SourceString argument = tag.argument.value.copyWithoutQuotes(1, 1);
       Uri resolved = base.resolve(argument.toString());
@@ skipping 80 matching lines @@
     } else {
       for (Link<Element> link = imported.topLevelElements; !link.isEmpty();
            link = link.tail) {
         compiler.withCurrentElement(link.head, () {
             library.define(link.head, compiler);
           });
       }
     }
   }
 }