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

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 9f1484332e5f33016caad96a3dca37adb7c7bd40..204fd10893266c218eaa568fc2796b6537a3fc19 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -86,6 +86,8 @@ import 'null_compiler_output.dart' show
     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
@@ -2028,6 +2030,11 @@ class _CompilerParsing implements Parsing {
       }
     });
   }
+
+  ScannerOptions getScannerOptionsFor(Element element) {
+    return new ScannerOptions(
+      canUseNative: compiler.backend.canLibraryUseNative(element.library));
+  }
 }
 
 class GlobalDependencyRegistry extends CodegenRegistry {