Add FunctionEntity.asyncMarker and refactor SourceInformationStrategy to avoid ResolvedAst

tests/compiler/dart2js/sourcemaps/sourcemap_helper.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 sourcemap.helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/apiimpl.dart' as api;
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/null_compiler_output.dart' show NullSink;
 import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/helpers/helpers.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/io/code_output.dart';
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/io/source_information.dart';
 import 'package:compiler/src/io/position_information.dart';
 import 'package:compiler/src/js/js.dart' as js;
 import 'package:compiler/src/js/js_debug.dart';
 import 'package:compiler/src/js/js_source_mapping.dart';
 import 'package:compiler/src/js_backend/js_backend.dart';
@@ skipping 169 matching lines @@
     extends JavaScriptSourceInformationStrategy {
   final JavaScriptSourceInformationStrategy strategy;
   final Map<RecordedSourceInformationProcess, js.Node> processMap =
       <RecordedSourceInformationProcess, js.Node>{};
   final Map<js.Node, RecordedSourceInformationProcess> nodeMap =
       <js.Node, RecordedSourceInformationProcess>{};
 
   RecordingSourceInformationStrategy(this.strategy);
 
   @override
-  SourceInformationBuilder createBuilderForContext(ResolvedAst resolvedAst) {
-    return strategy.createBuilderForContext(resolvedAst);
+  SourceInformationBuilder createBuilderForContext(MemberEntity member) {
+    return strategy.createBuilderForContext(member);
   }
 
   @override
   SourceInformationProcessor createProcessor(
       SourceMapperProvider provider, SourceInformationReader reader) {
     LocationMap nodeToSourceLocationsMap = new _LocationRecorder();
     CodePositionRecorder codePositions = new CodePositionRecorder();
     return new RecordingSourceInformationProcessor(
         this,
         strategy.createProcessor(
@@ skipping 356 matching lines @@
       absoluteUri = base.resolveUri(uri);
     } else {
       absoluteUri = base.resolve(uri);
     }
     return sourceFiles.putIfAbsent(absoluteUri, () {
       String text = new File.fromUri(absoluteUri).readAsStringSync();
       return new StringSourceFile.fromUri(absoluteUri, text);
     });
   }
 }