Add J-elements

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

Index: pkg/compiler/lib/src/js_backend/element_strategy.dart
diff --git a/pkg/compiler/lib/src/js_backend/element_strategy.dart b/pkg/compiler/lib/src/js_backend/element_strategy.dart
index 466823af0380d3c832172eec2c8b1940a59007c8..129a0520d2160af6d6a2ce102084b784ef518e4d 100644
--- a/pkg/compiler/lib/src/js_backend/element_strategy.dart
+++ b/pkg/compiler/lib/src/js_backend/element_strategy.dart
@@ -7,6 +7,7 @@ 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';
@@ -61,11 +62,11 @@ class ElementBackendStrategy implements BackendStrategy {
   }
 
   @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 {