RFC: introduce dart:js

sdk/lib/_internal/compiler/implementation/native_handler.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 native;
 
 import 'dart:collection' show Queue;
 import 'dart2jslib.dart' hide SourceString;
 import 'dart_types.dart';
 import 'elements/elements.dart';
@@ skipping 477 matching lines @@
 
 void maybeEnableNative(Compiler compiler,
                        LibraryElement library) {
   String libraryName = library.canonicalUri.toString();
   if (library.entryCompilationUnit.script.name.contains(
           'dart/tests/compiler/dart2js_native')
       || libraryName == 'dart:async'
       || libraryName == 'dart:html'
       || libraryName == 'dart:html_common'
       || libraryName == 'dart:indexed_db'
+      || libraryName == 'dart:js'
       || libraryName == 'dart:svg'
       || libraryName == 'dart:typed_data'
       || libraryName == 'dart:web_audio'
       || libraryName == 'dart:web_gl'
       || libraryName == 'dart:web_sql') {
     library.canUseNative = true;
   }
 }
 
 class SideEffectsVisitor extends js.BaseVisitor {
@@ skipping 510 matching lines @@
           'native "..." syntax is restricted to functions with zero parameters',
           node: nativeBody);
     }
     LiteralString jsCode = nativeBody.asLiteralString();
     builder.push(new HForeign.statement(
         new js.LiteralStatement(jsCode.dartString.slowToString()),
         <HInstruction>[],
         new SideEffects()));
   }
 }