Revert "Tweak public APIs and use them in patch_sdk, dart2js, and kernel-service."

pkg/compiler/tool/generate_kernel.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.
 
 /// Helper to run fasta with the right target configuration to build dart2js
 /// applications using the dart2js platform libraries.
 // TODO(sigmund): delete this file once we can configure fasta directly on the
 // command line.
 library compiler.tool.generate_kernel;
 
-import 'dart:io';
+import 'dart:io' show exitCode;
 
-import 'package:args/args.dart';
-import 'package:compiler/src/kernel/dart2js_target.dart';
-import 'package:front_end/front_end.dart';
-import 'package:front_end/src/fasta/util/relativize.dart';
-import 'package:kernel/kernel.dart';
-import 'package:kernel/target/targets.dart';
+import 'package:front_end/src/fasta/compiler_command_line.dart'
+    show CompilerCommandLine;
+import 'package:front_end/src/fasta/compiler_context.dart' show CompilerContext;
+import 'package:front_end/src/fasta/errors.dart' show InputError;
+import 'package:front_end/src/fasta/ticker.dart' show Ticker;
+import 'package:compiler/src/kernel/fasta_support.dart' show Dart2jsCompileTask;
 
-main(List<String> args) async {
-  ArgResults flags = _argParser.parse(args);
-  var options = new CompilerOptions()
-    ..target = new Dart2jsTarget(new TargetFlags())
-    ..packagesFileUri = Platform.script.resolve('../../../.packages')
-    ..compileSdk = true
-    ..linkedDependencies = [Uri.base.resolve(flags['platform'])]
-    ..onError = errorHandler;
-
-  if (flags.rest.isEmpty) {
-    var script = relativizeUri(Platform.script);
-    var platform = relativizeUri(Uri.base.resolve(flags['platform']));
-    print('usage: ${Platform.executable} $script '
-        '[--platform=$platform] [--out=out.dill] program.dart');
-    exit(1);
+main(List<String> arguments) async {
+  try {
+    await CompilerCommandLine.withGlobalOptions("generate_kernel", arguments,
+        (CompilerContext c) async {
+      if (c.options.verbose) {
+        print("Compiling directly to Kernel: ${arguments.join(' ')}");
+      }
+      var task =
+          new Dart2jsCompileTask(c, new Ticker(isVerbose: c.options.verbose));
+      await task.compile();
+    });
+  } on InputError catch (e) {
+    exitCode = 1;
+    print(e.format());
+    return null;
   }
-
-  Uri entry = Uri.base.resolve(flags.rest.first);
-  var program = await kernelForProgram(entry, options);
-  program.uriToSource.clear();
-  await writeProgramToBinary(program, flags['out']);
 }
-
-void errorHandler(CompilationError e) {
-  exitCode = 1;
-  print(e.message);
-}
-
-ArgParser _argParser = new ArgParser()
-  ..addOption('platform',
-      help: 'location of the precompiled dart2js sdk',
-      defaultsTo: _defaultPlatform)
-  ..addOption('out',
-      abbr: 'o', help: 'output location', defaultsTo: 'out.dill');
-
-String _defaultPlatform = Uri
-    .parse(Platform.resolvedExecutable)
-    .resolve('patched_dart2js_sdk/platform.dill')
-    .toString();