Reapply "Use backend targets to run Kernel transformations in Fasta"

pkg/compiler/lib/src/kernel/fasta_support.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.
 
 /// Additions to Fasta for generating .dill (Kernel IR) files with dart2js patch
 /// files and native hooks.
 library compiler.src.kernel.fasta_support;
 
 // TODO(sigmund): get rid of this file. Fasta should be agnostic of the
 // target platform, at which point this should not be necessary. In particular,
 // we need to:
 //  - add a fasta flag to configure the platform library location.
 //  - add a fasta flag to specify which sdk libraries should be built-in
 //    (that would replace `loadExtraRequiredLibraries`).
 //  - add flags to fasta to turn on various transformations.
 //  - get rid of `native` in dart2js patches or unify the syntax with the VM.
 
 import 'dart:async' show Future;
 import 'dart:io' show exitCode;
 
 import 'package:front_end/file_system.dart';
 import 'package:front_end/physical_file_system.dart';
 import 'package:front_end/src/fasta/kernel/utils.dart';
 import 'package:kernel/ast.dart' show Source, Library;
+import 'package:kernel/target/targets.dart' show TargetFlags;
 
 import 'package:front_end/src/fasta/builder/builder.dart' show LibraryBuilder;
 import 'package:front_end/src/fasta/compiler_context.dart' show CompilerContext;
 import 'package:front_end/src/fasta/dill/dill_target.dart' show DillTarget;
 import 'package:front_end/src/fasta/fasta.dart' show CompileTask;
 import 'package:front_end/src/fasta/kernel/kernel_target.dart'
     show KernelTarget;
 import 'package:front_end/src/fasta/loader.dart' show Loader;
 import 'package:front_end/src/fasta/parser/parser.dart' show optional;
 import 'package:front_end/src/fasta/source/source_loader.dart'
@@ skipping 47 matching lines @@
   }
 }
 
 /// Specializes [KernelTarget] to build kernel for dart2js: no transformations
 /// are run, JS-specific libraries are included in the SDK, and native clauses
 /// have no string parameter.
 class KernelTargetForDart2js extends KernelTarget {
   KernelTargetForDart2js(
       DillTarget target, TranslateUri uriTranslator, bool strongMode,
       [Map<String, Source> uriToSource])
-      : super(PhysicalFileSystem.instance, target, uriTranslator, strongMode,
-            uriToSource);
+      : super(PhysicalFileSystem.instance, target, uriTranslator, uriToSource);
   @override
   SourceLoader<Library> createLoader() =>
       new SourceLoaderForDart2js<Library>(fileSystem, this);
 
   @override
   bool enableNative(LibraryBuilder library) => maybeEnableNative(library.uri);
 
   @override
   Token skipNativeClause(Token token) => _skipNative(token);
 
@@ skipping 28 matching lines @@
   bool canImplementRestrictedTypes(LibraryBuilder library) =>
       library == coreLibrary || library == interceptorsLibrary;
 
   SourceLoaderForDart2js(FileSystem fs, KernelTarget target)
       : super(fs, target);
 }
 
 /// Specializes [DillTarget] to build kernel for dart2js: JS-specific libraries
 /// are included in the SDK, and native clauses have no string parameter.
 class DillTargetForDart2js extends DillTarget {
-  DillTargetForDart2js(Ticker ticker, TranslateUri uriTranslator)
-      : super(ticker, uriTranslator, "none");
+  DillTargetForDart2js(Ticker ticker, TranslateUri uriTranslator,
+      {TargetFlags flags})
+      : super(ticker, uriTranslator, "none", flags: flags);
 
   @override
   Token skipNativeClause(Token token) => _skipNative(token);
 
   @override
   String extractNativeMethodName(Token token) => "";
 
   @override
   void loadExtraRequiredLibraries(Loader loader) => _loadExtras(loader);
 }
@@ skipping 38 matching lines @@
   'dart:html_common',
   'dart:indexed_db',
   'dart:js',
   'dart:js_util',
   'dart:mirrors',
   'dart:svg',
   'dart:web_audio',
   'dart:web_gl',
   'dart:web_sql',
 ];