Introduce the legium component in test.dart, and start support for dart:dom and dart:html.

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(() {
@@ skipping 74 matching lines @@
     compiler.dietParser.dietParse(compilationUnit, tokens);
   }
 
   LibraryElement loadLibrary(Uri uri, ScriptTag node) {
     bool newLibrary = false;
     LibraryElement library =
       compiler.universe.libraries.putIfAbsent(uri.toString(), () {
           newLibrary = true;
           Script script = compiler.readScript(uri, node);
           LibraryElement element = new LibraryElement(script);
-          native.checkNativeSupport(compiler, element);
+          native.checkNativeSupport(compiler, element, uri);
           return element;
         });
     if (newLibrary) {
       compiler.withCurrentElement(library, () => scan(library));
     }
     return library;
   }
 
   void importLibrary(LibraryElement library, LibraryElement imported,
                      LiteralString prefix) {
@@ skipping 15 matching lines @@
   final String name = 'Diet Parser';
 
   dietParse(CompilationUnitElement compilationUnit, Token tokens) {
     measure(() {
       ElementListener listener = new ElementListener(compiler, compilationUnit);
       PartialParser parser = new PartialParser(listener);
       parser.parseUnit(tokens);
     });
   }
 }