Add support for compiling Dart via the FE in dart2js.

pkg/compiler/lib/src/resolution/resolution_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.resolution_strategy;
 
 import 'package:front_end/src/fasta/scanner.dart' show Token;
 
+import '../../compiler_new.dart' as api;
 import '../common.dart';
 import '../common_elements.dart';
 import '../common/backend_api.dart';
 import '../common/names.dart';
 import '../common/resolution.dart';
 import '../common/tasks.dart';
 import '../common/work.dart';
 import '../compiler.dart';
 import '../constants/values.dart';
 import '../elements/elements.dart';
@@ skipping 47 matching lines @@
   ResolutionFrontEndStrategy.internal(
       this._compiler, this._elementEnvironment, this.commonElements);
 
   ElementEnvironment get elementEnvironment => _elementEnvironment;
 
   DartTypes get dartTypes => _compiler.resolution.types;
 
   LibraryLoaderTask createLibraryLoader(
       ResolvedUriTranslator uriTranslator,
       ScriptLoader scriptLoader,
+      api.CompilerInput compilerInput,
       ElementScanner scriptScanner,
       LibraryDeserializer deserializer,
       PatchResolverFunction patchResolverFunc,
       PatchParserTask patchParser,
       Environment environment,
       DiagnosticReporter reporter,
       Measurer measurer) {
     return new ResolutionLibraryLoaderTask(
         uriTranslator,
         scriptLoader,
@@ skipping 864 matching lines @@
 
   @override
   void forEachConstructor(
       covariant ClassElement cls, void f(ConstructorEntity constructor)) {
     cls.constructors.forEach((Element _constructor) {
       ConstructorElement constructor = _constructor;
       f(constructor);
     });
   }
 }