Add J-elements

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

 // Copyright (c) 2017, 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.element_strategy;
 
 import '../backend_strategy.dart';
 import '../common.dart';
 import '../common/codegen.dart';
+import '../common/tasks.dart';
 import '../common/work.dart';
 import '../compiler.dart';
 import '../elements/elements.dart';
 import '../enqueue.dart';
 import '../io/multi_information.dart' show MultiSourceInformationStrategy;
 import '../io/position_information.dart' show PositionSourceInformationStrategy;
 import '../io/source_information.dart';
 import '../io/start_end_information.dart'
     show StartEndSourceInformationStrategy;
 import '../js/js_source_mapping.dart' show JavaScriptSourceInformationStrategy;
@@ skipping 34 matching lines @@
         nativeBasicData, closedWorld, selectorConstraintsStrategy);
   }
 
   @override
   WorkItemBuilder createCodegenWorkItemBuilder(ClosedWorld closedWorld) {
     return new ElementCodegenWorkItemBuilder(
         _compiler.backend, closedWorld, _compiler.options);
   }
 
   @override
-  SsaBuilderTask createSsaBuilderTask(JavaScriptBackend backend,
+  SsaBuilder createSsaBuilder(CompilerTask task, JavaScriptBackend backend,
       SourceInformationStrategy sourceInformationStrategy) {
     return _compiler.options.useKernel
-        ? new RastaSsaBuilderTask(backend, sourceInformationStrategy)
-        : new SsaAstBuilderTask(backend, sourceInformationStrategy);
+        ? new RastaSsaBuilder(task, backend, sourceInformationStrategy)
+        : new SsaAstBuilder(task, backend, sourceInformationStrategy);
   }
 
   SourceInformationStrategy get sourceInformationStrategy {
     return _sourceInformationStrategy ??= createSourceInformationStrategy(
         generateSourceMap: _compiler.options.generateSourceMap,
         useMultiSourceInfo: _compiler.options.useMultiSourceInfo,
         useNewSourceInfo: _compiler.options.useNewSourceInfo);
   }
 
   static SourceInformationStrategy createSourceInformationStrategy(
@@ skipping 74 matching lines @@
 
   MemberElement get element => resolvedAst.element;
 
   WorldImpact run() {
     registry = new CodegenRegistry(element);
     return _backend.codegen(this, _closedWorld);
   }
 
   String toString() => 'CodegenWorkItem(${resolvedAst.element})';
 }