Reapply "Create an app snapshot of the Dart front end."

utils/kernel-service/BUILD.gn

Index: utils/kernel-service/BUILD.gn
diff --git a/utils/kernel-service/BUILD.gn b/utils/kernel-service/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..93f66f1972364dc80c3c6f30ed89bb42d1f3330c
--- /dev/null
+++ b/utils/kernel-service/BUILD.gn
@@ -0,0 +1,16 @@
+# 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.
+
+import("../application_snapshot.gni")
+
+application_snapshot("kernel-service") {
+  dfe_script = "kernel-service.dart"
+  deps = [
+    "../../runtime/vm:patched_sdk($host_toolchain)",
+  ]
+  main_dart = dfe_script
+  training_args = [
+      "file://" + rebase_path("../../pkg/compiler/lib/src/dart2js.dart"),
+  ]
+}