Move native and js interop properties from the element model to the JS backend

pkg/compiler/lib/src/compiler.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 dart2js.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 68 matching lines @@
     LibraryLoader,
     LibraryLoaderTask,
     LoadedLibraries;
 import 'mirrors_used.dart' show
     MirrorUsageAnalyzerTask;
 import 'null_compiler_output.dart' show
     NullCompilerOutput,
     NullSink;
 import 'parser/diet_parser_task.dart' show
     DietParserTask;
+import 'parser/element_listener.dart' show
+    ScannerOptions;
 import 'parser/parser_task.dart' show
     ParserTask;
 import 'patch_parser.dart' show
     PatchParserTask;
 import 'resolution/registry.dart' show
     ResolutionRegistry;
 import 'resolution/resolution.dart' show
     ResolverTask;
 import 'resolution/tree_elements.dart' show
     TreeElementMapping;
@@ skipping 1922 matching lines @@
   measure(f()) => compiler.parser.measure(f);
 
   @override
   void parsePatchClass(ClassElement cls) {
     compiler.patchParser.measure(() {
       if (cls.isPatch) {
         compiler.patchParser.parsePatchClassNode(cls);
       }
     });
   }
+
+  ScannerOptions getScannerOptionsFor(Element element) {
+    return new ScannerOptions(
+      canUseNative: compiler.backend.canLibraryUseNative(element.library));
+  }
 }
 
 class GlobalDependencyRegistry extends CodegenRegistry {
   Setlet<Element> _otherDependencies;
 
   GlobalDependencyRegistry(Compiler compiler)
       : super(compiler, new TreeElementMapping(null));
 
   void registerDependency(Element element) {
     if (element == null) return;
     if (_otherDependencies == null) {
       _otherDependencies = new Setlet<Element>();
     }
     _otherDependencies.add(element.implementation);
   }
 
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
 }