Handle js interop members in impact computation.

pkg/compiler/lib/src/kernel/element_map.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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../constants/values.dart';
 import '../common_elements.dart';
 import '../elements/entities.dart';
 import '../elements/jumps.dart';
 import '../elements/names.dart';
 import '../elements/types.dart';
 import '../js/js.dart' as js;
 import '../js_backend/namer.dart';
+import '../js_backend/native_data.dart';
 import '../js_emitter/code_emitter_task.dart';
 import '../native/native.dart' as native;
 import '../types/types.dart';
 import '../universe/call_structure.dart';
 import '../universe/selector.dart';
 import '../world.dart';
 
 /// Interface that translates between Kernel IR nodes and entities.
 abstract class KernelToElementMap {
   /// Access to the commonly used elements and types.
@@ skipping 70 matching lines @@
   /// Computes the [ConstantValue] for the constant [expression].
   // TODO(johnniwinther): Move to [KernelToElementMapForBuilding]. This is only
   // used in impact builder for symbol constants.
   ConstantValue getConstantValue(ir.Expression expression,
       {bool requireConstant: true, bool implicitNull: false});
 }
 
 /// Interface that translates between Kernel IR nodes and entities used for
 /// computing the [WorldImpact] for members.
 abstract class KernelToElementMapForImpact extends KernelToElementMap {
+  NativeBasicData get nativeBasicData;
+
   /// Adds libraries in [program] to the set of libraries.
   ///
   /// The main method of the first program is used as the main method for the
   /// compilation.
   void addProgram(ir.Program program);
 
   /// Returns the [ConstructorEntity] corresponding to a super initializer in
   /// [constructor].
   ///
   /// The IR resolves super initializers to a [target] up in the type hierarchy.
@@ skipping 325 matching lines @@
       uri = Uri.parse(node.location.file);
       break;
     }
     node = node.parent;
   }
   if (uri != null) {
     return new SourceSpan(uri, offset, offset + 1);
   }
   return null;
 }