Add getTarget method to CompilerCommandLine

pkg/front_end/lib/src/fasta/vm.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.
 
 /// API for compiling Dart source code to .dill (Kernel IR) files.
 library front_end.vm;
 // TODO(ahe): Convert this file to use the API in `../../kernel_generator.dart`
 // and `../../compiler_options.dart`.
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File, Platform;
 
 import 'dart:typed_data' show Uint8List;
 
 import 'package:front_end/file_system.dart';
 import 'package:front_end/physical_file_system.dart';
 
 import 'fasta.dart' as fasta;
 
+import 'package:kernel/target/targets.dart' show TargetFlags;
+import 'package:kernel/target/vm_fasta.dart' show VmFastaTarget;
+
 /// Compilation status codes.
 ///
 /// Note: The [index] property of these constants must match
 /// `Dart_KernelCompilationStatus` in
 /// [dart_api.h](../../../../runtime/include/dart_api.h).
 enum Status {
   /// Compilation was successful.
   ok,
 
   /// Compilation failed with a compile time error.
@@ skipping 46 matching lines @@
 
   if (verbose) {
     print("""DFE: Requesting compilation {
   scriptUri: ${script}
   packagesUri: ${packagesUri}
   patchedSdk: ${patchedSdk}
 }""");
   }
 
   try {
-    return await fasta.parseScriptInFileSystem(
-        script, fileSystem, packagesUri, patchedSdk,
-        verbose: verbose, strongMode: strongMode);
+    return await fasta.parseScriptInFileSystem(script, fileSystem, packagesUri,
+        patchedSdk, new VmFastaTarget(new TargetFlags(strongMode: strongMode)),
+        verbose: verbose);
   } catch (err, stack) {
     return new CompilationResult.crash(err, stack);
   }
 }
 
 class _CompilationOk extends CompilationResult {
   final Uint8List bytes;
 
   _CompilationOk(this.bytes) : super._();
 
@@ skipping 53 matching lines @@
     if (await fileSystem.entityForUri(packagesFile).exists()) {
       return packagesFile;
     }
     if (dir.parent.path == dir.path) {
       break;
     }
     dir = dir.parent;
   }
   return null;
 }