Refactor Parsing to remove compiler dependency

tests/compiler/dart2js/serialization_helper.dart

 // Copyright (c) 2016, 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.serialization_helper;
 
+import 'dart:async';
 import 'dart:io';
-import 'dart:async';
-import 'package:async_helper/async_helper.dart';
-import 'package:expect/expect.dart';
-import 'package:compiler/compiler_new.dart';
+
+import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
-import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common/backend_api.dart';
 import 'package:compiler/src/common/names.dart';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
-import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/scanner/scanner.dart';
-import 'package:compiler/src/serialization/element_serialization.dart';
+import 'package:compiler/src/script.dart';
 import 'package:compiler/src/serialization/impact_serialization.dart';
 import 'package:compiler/src/serialization/json_serializer.dart';
 import 'package:compiler/src/serialization/resolved_ast_serialization.dart';
 import 'package:compiler/src/serialization/serialization.dart';
-import 'package:compiler/src/serialization/modelz.dart';
 import 'package:compiler/src/serialization/task.dart';
 import 'package:compiler/src/tokens/token.dart';
-import 'package:compiler/src/script.dart';
 import 'package:compiler/src/universe/world_impact.dart';
+
 import 'memory_compiler.dart';
 
 class Arguments {
   final String filename;
   final bool loadSerializedData;
   final bool saveSerializedData;
   final String serializedDataFileName;
   final bool verbose;
 
   const Arguments({
@@ skipping 132 matching lines @@
   final bool _deserializeResolvedAst;
 
   _DeserializerSystem(
       Compiler compiler,
       this._deserializer,
       this._impactTransformer,
       {bool deserializeResolvedAst: false})
       : this._compiler = compiler,
         this._deserializeResolvedAst = deserializeResolvedAst,
         this._resolvedAstDeserializer = deserializeResolvedAst
-           ? new ResolvedAstDeserializerPlugin(compiler.parsing) : null {
+           ? new ResolvedAstDeserializerPlugin(compiler.parsingContext) : null {
     _deserializer.plugins.add(_resolutionImpactDeserializer);
     if (_deserializeResolvedAst) {
       _deserializer.plugins.add(_resolvedAstDeserializer);
     }
   }
 
   @override
   Future<LibraryElement> readLibrary(Uri resolvedUri) {
     LibraryElement library = _deserializer.lookupLibrary(resolvedUri);
     if (library != null) {
@@ skipping 66 matching lines @@
       assert(invariant(element, resolution.hasResolvedAst(element),
           message: "Element $element must have a resolved ast"));
       ResolvedAst resolvedAst = resolution.getResolvedAst(element);
       ObjectEncoder objectEncoder = createEncoder(RESOLVED_AST_TAG);
       new ResolvedAstSerializer(objectEncoder, resolvedAst).serialize();
     }
   }
 }
 
 class ResolvedAstDeserializerPlugin extends DeserializerPlugin {
-  final Parsing parsing;
+  final ParsingContext parsingContext;
   final Map<Uri, SourceFile> sourceFiles = <Uri, SourceFile>{};
 
   Map<Element, ResolvedAst> _resolvedAstMap = <Element, ResolvedAst>{};
   Map<Element, ObjectDecoder> _decoderMap = <Element, ObjectDecoder>{};
   Map<Uri, Token> beginTokenMap = <Uri, Token>{};
 
-  ResolvedAstDeserializerPlugin(this.parsing);
+  ResolvedAstDeserializerPlugin(this.parsingContext);
 
   bool hasResolvedAst(Element element) {
     return _resolvedAstMap.containsKey(element) ||
         _decoderMap.containsKey(element);
   }
 
   ResolvedAst getResolvedAst(Element element) {
     ResolvedAst resolvedAst = _resolvedAstMap[element];
     if (resolvedAst == null) {
       ObjectDecoder decoder = _decoderMap[element];
       if (decoder != null) {
         resolvedAst = _resolvedAstMap[element] =
             ResolvedAstDeserializer.deserialize(
-                element, decoder, parsing, findToken);
+                element, decoder, parsingContext, findToken);
         _decoderMap.remove(element);
       }
     }
     return resolvedAst;
   }
 
   Token findToken(Uri uri, int offset) {
     Token beginToken = beginTokenMap.putIfAbsent(uri, () {
       SourceFile sourceFile = sourceFiles[uri];
       if (sourceFile == null) {
         throw 'No source file found for $uri in:\n '
               '${sourceFiles.keys.join('\n ')}';
       }
       return new Scanner(sourceFile).tokenize();
     });
     return ResolvedAstDeserializer.findTokenInStream(beginToken, offset);
   }
 
   @override
   void onElement(Element element, ObjectDecoder getDecoder(String tag)) {
     ObjectDecoder decoder = getDecoder(RESOLVED_AST_TAG);
     if (decoder != null) {
       _decoderMap[element] = decoder;
     }
   }
 }