Implement JsKernelToElementMap through KernelToElementMapBase

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 Future;
 
 import '../compiler_new.dart' as api;
 import 'backend_strategy.dart';
@@ skipping 618 matching lines @@
         }
 
         backend.onCodegenEnd();
 
         checkQueues(resolutionEnqueuer, codegenEnqueuer);
       });
 
   Enqueuer startCodegen(ClosedWorld closedWorld) {
     Enqueuer codegenEnqueuer = enqueuer.createCodegenEnqueuer(closedWorld);
     _codegenWorldBuilder = codegenEnqueuer.worldBuilder;
-    codegenEnqueuer
-        .applyImpact(backend.onCodegenStart(closedWorld, _codegenWorldBuilder));
+    codegenEnqueuer.applyImpact(backend.onCodegenStart(
+        closedWorld, _codegenWorldBuilder, backendStrategy.sorter));
     return codegenEnqueuer;
   }
 
   /// Perform the steps needed to fully end the resolution phase.
   ClosedWorldRefiner closeResolution(FunctionEntity mainFunction) {
     phase = PHASE_DONE_RESOLVING;
 
     ClosedWorld closedWorld = resolutionWorldBuilder.closeWorld();
     ClosedWorldRefiner closedWorldRefiner =
         backendStrategy.createClosedWorldRefiner(closedWorld);
@@ skipping 943 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }