Access BackendUsage through ClosedWorld

pkg/compiler/lib/src/frontend_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.frontend_strategy;
 
 import 'common.dart';
 import 'common_elements.dart';
 import 'common/backend_api.dart';
 import 'common/tasks.dart';
@@ skipping 48 matching lines @@
   /// Creates the [NoSuchMethodResolver] corresponding the resolved model of
   /// this strategy.
   NoSuchMethodResolver createNoSuchMethodResolver();
 
   /// Creates the [ResolutionWorldBuilder] corresponding to the element model
   /// used in this strategy.
   ResolutionWorldBuilder createResolutionWorldBuilder(
       NativeBasicData nativeBasicData,
       NativeDataBuilder nativeDataBuilder,
       InterceptorDataBuilder interceptorDataBuilder,
+      BackendUsageBuilder backendUsageBuilder,
       SelectorConstraintsStrategy selectorConstraintsStrategy);
 
   /// Creates the [WorkItemBuilder] corresponding to how a resolved model for
   /// a single member is obtained in this strategy.
   WorkItemBuilder createResolutionWorkItemBuilder(
       NativeBasicData nativeBasicData,
       NativeDataBuilder nativeDataBuilder,
       ImpactTransformer impactTransformer);
 
   /// Computes the main function from [mainLibrary] adding additional world
@@ skipping 23 matching lines @@
 abstract class AnnotationProcessor {
   void extractNativeAnnotations(
       LibraryEntity library, NativeBasicDataBuilder nativeBasicDataBuilder);
 
   void extractJsInteropAnnotations(
       LibraryEntity library, NativeBasicDataBuilder nativeBasicDataBuilder);
 
   void processJsInteropAnnotations(
       NativeBasicData nativeBasicData, NativeDataBuilder nativeDataBuilder);
 }