Compute NativeBehavior for foreign functions.

pkg/compiler/lib/src/js_backend/backend_helpers.dart

 // Copyright (c) 2015, 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 dart2js.js_backend.helpers;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers, Uris;
 import '../common/resolution.dart' show Resolution;
 import '../compiler.dart' show Compiler;
@@ skipping 26 matching lines @@
   static final Uri DART_JS_NAMES = new Uri(scheme: 'dart', path: '_js_names');
   static final Uri DART_EMBEDDED_NAMES =
       new Uri(scheme: 'dart', path: '_js_embedded_names');
   static final Uri DART_ISOLATE_HELPER =
       new Uri(scheme: 'dart', path: '_isolate_helper');
   static final Uri PACKAGE_JS = new Uri(scheme: 'package', path: 'js/js.dart');
 
   static const String INVOKE_ON = '_getCachedInvocation';
   static const String START_ROOT_ISOLATE = 'startRootIsolate';
 
+  static const String JS = 'JS';
+  static const String JS_BUILTIN = 'JS_BUILTIN';
+  static const String JS_EMBEDDED_GLOBAL = 'JS_EMBEDDED_GLOBAL';
+  static const String JS_INTERCEPTOR_CONSTANT = 'JS_INTERCEPTOR_CONSTANT';
+
   final Compiler compiler;
 
   Element cachedCheckConcurrentModificationError;
 
   BackendHelpers(this.compiler);
 
   JavaScriptBackend get backend => compiler.backend;
 
   Resolution get resolution => backend.resolution;
 
@@ skipping 655 matching lines @@
   MethodElement _objectNoSuchMethod;
 
   MethodElement get objectNoSuchMethod {
     if (_objectNoSuchMethod == null) {
       _objectNoSuchMethod =
           coreClasses.objectClass.lookupLocalMember(Identifiers.noSuchMethod_);
     }
     return _objectNoSuchMethod;
   }
 }