Add FunctionEntity.asyncMarker and refactor SourceInformationStrategy to avoid ResolvedAst

pkg/compiler/lib/src/io/source_information.dart

 // Copyright (c) 2015, 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.source_information;
 
 import 'package:kernel/ast.dart' show Location;
 import '../common.dart';
 import '../elements/elements.dart'
     show
         AstElement,
         CompilationUnitElement,
         LocalElement,
         ResolvedAst,
         ResolvedAstKind;
+import '../elements/entities.dart';
 import '../js/js.dart' show JavaScriptNodeSourceInformation;
 import '../script.dart';
 import '../tree/tree.dart' show Node;
 import 'source_file.dart';
 
 /// Interface for passing source information, for instance for use in source
 /// maps, through the backend.
 abstract class SourceInformation extends JavaScriptNodeSourceInformation {
   const SourceInformation();
 
@@ skipping 12 matching lines @@
   List<SourceLocation> get sourceLocations;
 
   /// Return a short textual representation of the source location.
   String get shortText;
 }
 
 /// Strategy for creating, processing and applying [SourceInformation].
 class SourceInformationStrategy {
   const SourceInformationStrategy();
 
-  /// Create a [SourceInformationBuilder] for [resolvedAst].
-  SourceInformationBuilder createBuilderForContext(ResolvedAst resolvedAst) {
+  /// Create a [SourceInformationBuilder] for [member].
+  SourceInformationBuilder createBuilderForContext(MemberEntity member) {
     return const SourceInformationBuilder();
   }
 
   /// Generate [SourceInformation] marker for non-preamble code.
   SourceInformation buildSourceMappedMarker() => null;
 
   /// Called when compilation has completed.
   void onComplete() {}
 }
 
 /// Interface for generating [SourceInformation].
 class SourceInformationBuilder {
   const SourceInformationBuilder();
 
-  /// Create a [SourceInformationBuilder] for [resolvedAst].
-  SourceInformationBuilder forContext(ResolvedAst resolvedAst) => this;
+  /// Create a [SourceInformationBuilder] for [member].
+  SourceInformationBuilder forContext(MemberEntity member) => this;
 
-  /// Generate [SourceInformation] the declaration of the element in
-  /// [resolvedAst].
-  SourceInformation buildDeclaration(ResolvedAst resolvedAst) => null;
+  /// Generate [SourceInformation] the declaration of the [member].
+  SourceInformation buildDeclaration(MemberEntity member) => null;
 
   /// Generate [SourceInformation] for the generic [node].
   @deprecated
   SourceInformation buildGeneric(Node node) => null;
 
   /// Generate [SourceInformation] for an instantiation of a class using [node]
   /// for the source position.
   SourceInformation buildCreate(Node node) => null;
 
   /// Generate [SourceInformation] for the return [node].
@@ skipping 236 matching lines @@
   @override
   int get line => null;
 
   @override
   int get offset => null;
 
   String get shortName => '<no-location>';
 
   String toString() => '<no-location>';
 }