Add mode to test.dart to run dart2js with kernel, and include initial set of

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index a16141d952f263a1f8a8f51772c5bbf161648d4d..ad52d9ba505a573ba6a0c77141410c8b3af252d2 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -2229,6 +2229,9 @@ class TestUtils {
     if (compiler == "dart2js" && configuration["fast_startup"]) {
       args.add("--fast-startup");
     }
+    if (compiler == "dart2js" && configuration["dart2js_with_kernel"]) {
+      args.add("--use-kernel");
+    }
     if (compiler == "dart2analyzer") {
       args.add("--show-package-warnings");
       args.add("--enable-async");