Roll kernel to latest and add baseline test.

tests/compiler/dart2js/kernel/visitor_test.dart

+// Copyright (c) 2016, 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.
+
+/// Test that the dart2js copy of [KernelVisitor] generates the expected IR as
+/// defined by kernel spec-mode test files.
+
+import 'dart:io';
+import 'package:compiler/src/compiler.dart' show Compiler;
+import 'package:compiler/src/js_backend/backend.dart' show JavaScriptBackend;
+import 'package:compiler/src/commandline_options.dart' show Flags;
+import 'package:kernel/text/ast_to_text.dart';
+import 'package:path/path.dart' as pathlib;
+import 'package:test/test.dart';
+
+import '../memory_compiler.dart';
+
+const String TESTCASE_DIR = 'third_party/pkg/kernel/testcases/';
+
+const List<String> SKIP_TESTS = const <String>[
+  'DeltaBlue', // Super calls encoded as `super.{...` and not `this.{...`.
+  'external', // 'dart:_isolate_helper' is imported instead of 'dart:isolate'.
+];
+
+main(List<String> arguments) {
+  Directory directory = new Directory('${TESTCASE_DIR}/input');
+  for (FileSystemEntity file in directory.listSync()) {
+    if (file is File && file.path.endsWith('.dart')) {
+      String name = pathlib.basenameWithoutExtension(file.path);
+      bool selected = arguments.contains(name);
+      if (!selected) {
+        if (arguments.isNotEmpty) continue;
+        if (SKIP_TESTS.contains(name)) continue;
+      }
+
+      test(name, () async {
+        var result = await runCompiler(
+            entryPoint: file.absolute.uri,
+            options: [Flags.analyzeOnly, Flags.useKernel]);
+        Compiler compiler = result.compiler;
+        JavaScriptBackend backend = compiler.backend;
+        StringBuffer buffer = new StringBuffer();
+        new Printer(buffer).writeLibraryFile(
+            backend.kernelTask.kernel.libraryToIr(compiler.mainApp));
+        String actual = buffer.toString();
+        String expected =
+            new File('${TESTCASE_DIR}/spec-mode/$name.baseline.txt')
+                .readAsStringSync();
+        if (selected) {
+          String input =
+              new File('${TESTCASE_DIR}/input/$name.dart').readAsStringSync();
+          print('============================================================');
+          print(name);
+          print('--input-----------------------------------------------------');
+          print(input);
+          print('--expected--------------------------------------------------');
+          print(expected);
+          print('--actual----------------------------------------------------');
+          print(actual);
+        }
+        expect(actual, equals(expected));
+      });
+    }
+  }
+}