Add support for converted closures with explicit contexts to VM

pkg/kernel/test/closures/suite.dart

Index: pkg/kernel/test/closures/suite.dart
diff --git a/pkg/kernel/test/closures/suite.dart b/pkg/kernel/test/closures/suite.dart
index 6e246fac176b28f27ade41622041c5ab8fd0d1da..9eaa9acc4030fb381f1042f920550a3cff6312ae 100644
--- a/pkg/kernel/test/closures/suite.dart
+++ b/pkg/kernel/test/closures/suite.dart
@@ -4,6 +4,8 @@
 
 library test.kernel.closures.suite;
 
+import 'dart:io' show File;
+
 import 'dart:async' show Future;
 
 import 'package:front_end/physical_file_system.dart' show PhysicalFileSystem;
@@ -11,16 +13,20 @@ import 'package:front_end/physical_file_system.dart' show PhysicalFileSystem;
 import 'package:kernel/core_types.dart' show CoreTypes;
 
 import 'package:testing/testing.dart'
-    show Chain, ChainContext, Result, Step, TestDescription, runMe;
+    show
+        Chain,
+        ChainContext,
+        Result,
+        Step,
+        TestDescription,
+        runMe,
+        StdioProcess;
 
 import 'package:front_end/src/fasta/testing/patched_sdk_location.dart'
     show computePatchedSdk;
 
 import 'package:kernel/ast.dart' show Program, Library;
 
-import 'package:kernel/transformations/closure_conversion.dart'
-    as closure_conversion;
-
 import 'package:front_end/src/fasta/testing/kernel_chain.dart'
     show Print, MatchExpectation, WriteDill, ReadDill, Verify;
 
@@ -39,6 +45,9 @@ import 'package:front_end/src/fasta/testing/patched_sdk_location.dart';
 
 import 'package:kernel/kernel.dart' show loadProgramFromBinary;
 
+import 'package:kernel/transformations/closure_conversion.dart'
+    as closure_conversion;
+
 import 'package:kernel/target/targets.dart' show TargetFlags;
 
 import 'package:kernel/target/vm_fasta.dart' show VmFastaTarget;
@@ -51,9 +60,12 @@ class ClosureConversionContext extends ChainContext {
   final TranslateUri uriTranslator;
 
   final List<Step> steps;
+  final Uri vm;
+
+  Program platform;
 
   ClosureConversionContext(
-      this.strongMode, bool updateExpectations, this.uriTranslator)
+      this.vm, this.strongMode, bool updateExpectations, this.uriTranslator)
       : steps = <Step>[
           const FastaCompile(),
           const Print(),
@@ -65,24 +77,25 @@ class ClosureConversionContext extends ChainContext {
               updateExpectations: updateExpectations),
           const WriteDill(),
           const ReadDill(),
-          // TODO(29143): add `Run` step when Vectors are added to VM.
+          const Run(),
         ];
 
   Future<Program> loadPlatform() async {
-    Uri sdk = await computePatchedSdk();
-    return loadProgramFromBinary(sdk.resolve('platform.dill').toFilePath());
+    return platform ??= loadProgramFromBinary(
+        (await computePatchedSdk()).resolve('platform.dill').toFilePath());
   }
 
   static Future<ClosureConversionContext> create(
       Chain suite, Map<String, String> environment) async {
     Uri sdk = await computePatchedSdk();
+    Uri vm = computeDartVm(sdk);
     Uri packages = Uri.base.resolve(".packages");
     bool strongMode = environment.containsKey(STRONG_MODE);
     bool updateExpectations = environment["updateExpectations"] == "true";
     TranslateUri uriTranslator = await TranslateUri
         .parse(PhysicalFileSystem.instance, sdk, packages: packages);
     return new ClosureConversionContext(
-        strongMode, updateExpectations, uriTranslator);
+        vm, strongMode, updateExpectations, uriTranslator);
   }
 }
 
@@ -143,4 +156,22 @@ class ClosureConversion
   }
 }
 
+class Run extends Step<Uri, int, ClosureConversionContext> {
+  const Run();
+
+  String get name => "run";
+
+  Future<Result<int>> run(Uri uri, ClosureConversionContext context) async {
+    final File generated = new File.fromUri(uri);
+    try {
+      final StdioProcess process = await StdioProcess
+          .run(context.vm.toFilePath(), [generated.path, "Hello, World!"]);
+      print(process.output);
+      return process.toResult();
+    } finally {
+      generated.parent.delete(recursive: true);
+    }
+  }
+}
+
 main(List<String> arguments) => runMe(arguments, createContext, "testing.json");