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

pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart

 // Copyright (c) 2014, 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_emitter.program_builder;
 
 import '../js_emitter.dart' show
     ClassStubGenerator,
     CodeEmitterTask,
     computeMixinClass,
@@ skipping 351 matching lines @@
     // Interceptor class with implementations that directly call the
     // corresponding JavaScript member. We do not attempt to bind this when
     // tearing off JavaScript methods as we cannot distinguish between calling
     // a regular getter that returns a JavaScript function and tearing off
     // a method in the case where there exist multiple JavaScript classes
     // that conflict on whether the member is a getter or a method.
     var interceptorClass = _classes[backend.jsJavaScriptObjectClass];
     var stubNames = new Set<String>();
     librariesMap.forEach((LibraryElement library, List<Element> elements) {
       for (Element e in elements) {
-        if (e is ClassElement && e.isJsInterop) {
+        if (e is ClassElement && backend.isJsInterop(e)) {
           e.declaration.forEachMember((_, Element member) {
             if (!member.isInstanceMember) return;
             if (member.isGetter || member.isField || member.isFunction) {
               var selectors =
                   _compiler.codegenWorld.getterInvocationsByName(member.name);
               if (selectors != null && !selectors.isEmpty) {
                 for (var selector in selectors.keys) {
                   var stubName = namer.invocationName(selector);
                   if (stubNames.add(stubName.key)) {
                     interceptorClass.callStubs.add(_buildStubMethod(
@@ skipping 91 matching lines @@
   Class buildFieldsHackForIncrementalCompilation(ClassElement element) {
     assert(_compiler.hasIncrementalSupport);
 
     List<Field> instanceFields = _buildFields(element, false);
     js.Name name = namer.className(element);
 
     return new Class(
         element, name, null, [], instanceFields, [], [], [], [], [], [], null,
         isDirectlyInstantiated: true,
         onlyForRti: false,
-        isNative: element.isNative);
+        isNative: backend.isNative(element));
   }
 
   Class _buildClass(ClassElement element) {
     bool onlyForRti = collector.classesOnlyNeededForRti.contains(element);
-    if (element.isJsInterop) {
+    if (backend.isJsInterop(element)) {
       // TODO(jacobr): check whether the class has any active static fields
       // if it does not we can suppress it completely.
       onlyForRti = true;
     }
 
     List<Method> methods = [];
     List<StubMethod> callStubs = <StubMethod>[];
 
     ClassStubGenerator classStubGenerator =
         new ClassStubGenerator(_compiler, namer, backend);
@@ skipping 65 matching lines @@
     List<Field> staticFieldsForReflection =
         onlyForRti ? const <Field>[] : _buildFields(element, true);
 
     TypeTestProperties typeTests =
         runtimeTypeGenerator.generateIsTests(
             element,
             storeFunctionTypeInMetadata: _storeFunctionTypesInMetadata);
 
     List<StubMethod> checkedSetters = <StubMethod>[];
     List<StubMethod> isChecks = <StubMethod>[];
-    if (element.isJsInterop) {
+    if (backend.isJsInterop(element)) {
       typeTests.properties.forEach((js.Name name, js.Node code) {
         _classes[backend.jsInterceptorClass].isChecks.add(
             _buildStubMethod(name, code));
       });
     } else {
       for (Field field in instanceFields) {
         if (field.needsCheckedSetter) {
           assert(!field.needsUncheckedSetter);
           Element element = field.element;
           js.Expression code = backend.generatedCode[element];
           assert(code != null);
           js.Name name = namer.deriveSetterName(field.accessorName);
           checkedSetters.add(_buildStubMethod(name, code, element: element));
         }
       }
 
       typeTests.properties.forEach((js.Name name, js.Node code) {
         isChecks.add(_buildStubMethod(name, code));
       });
     }
 
     js.Name name = namer.className(element);
     String holderName = namer.globalObjectFor(element);
     // TODO(floitsch): we shouldn't update the registry in the middle of
     // building a class.
     Holder holder = _registry.registerHolder(holderName);
-    bool isInstantiated = !element.isJsInterop &&
+    bool isInstantiated = !backend.isJsInterop(element) &&
         _compiler.codegenWorld.directlyInstantiatedClasses.contains(element);
 
     Class result;
     if (element.isMixinApplication && !onlyForRti) {
-      assert(!element.isNative);
+      assert(!backend.isNative(element));
       assert(methods.isEmpty);
 
       result = new MixinApplication(element,
                                     name, holder,
                                     instanceFields,
                                     staticFieldsForReflection,
                                     callStubs,
                                     typeVariableReaderStubs,
                                     checkedSetters,
                                     isChecks,
                                     typeTests.functionTypeIndex,
                                     isDirectlyInstantiated: isInstantiated,
                                     onlyForRti: onlyForRti);
     } else {
       result = new Class(element,
                          name, holder, methods, instanceFields,
                          staticFieldsForReflection,
                          callStubs,
                          typeVariableReaderStubs,
                          noSuchMethodStubs,
                          checkedSetters,
                          isChecks,
                          typeTests.functionTypeIndex,
                          isDirectlyInstantiated: isInstantiated,
                          onlyForRti: onlyForRti,
-                         isNative: element.isNative);
+                         isNative: backend.isNative(element));
     }
     _classes[element] = result;
     return result;
   }
 
   bool _methodNeedsStubs(FunctionElement method) {
     return !method.functionSignature.optionalParameters.isEmpty;
   }
 
   bool _methodCanBeReflected(FunctionElement method) {
@@ skipping 317 matching lines @@
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 
   Holder _registerStaticStateHolder() {
     return _registry.registerHolder(
         namer.staticStateHolder, isStaticStateHolder: true);
   }
 }