Create an app snapshot of the Dart front end.

runtime/bin/BUILD.gn

 # Copyright (c) 2014, 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("gypi_contents.gni")
 import("../runtime_args.gni")
 
 # Generate a resources.cc file for the service isolate without Observatory.
 action("gen_resources_cc") {
   visibility = [ ":*" ]  # Only targets in this file can see this.
@@ skipping 471 matching lines @@
     rebase_path(vm_isolate_snapshot, root_build_dir),
     "--output_bin",
     rebase_path(isolate_snapshot, root_build_dir),
     "--target_os",
     current_os,
     "--timestamp_file",
     rebase_path(gen_snapshot_stamp_file, root_build_dir),
   ]
 }
 
+action("generate_dfe_snapshot") {
+  deps = [
+    "../bin:dart($host_toolchain)",
+    "../vm:patched_sdk($host_toolchain)",
+  ]
+
+  package_map = rebase_path("../../.packages")
+  dfe_script = rebase_path("../tools/kernel-service.dart")
+  dfe_snapshot = "$root_out_dir/kernel-service.dart.snapshot"
+  training_script =
+      "file://" + rebase_path("../../pkg/compiler/lib/src/dart2js.dart")
+  dart_dir = get_label_info("../bin:dart($host_toolchain)", "root_out_dir")
+  dart_path = rebase_path("$dart_dir/dart")
+
+  inputs = [
+    package_map,
+    dfe_script,
+  ]
+
+  outputs = [
+    dfe_snapshot,
+  ]
+
+  script = rebase_path("../../build/gn_run_binary.py")
+  args = [
+    "exec_script",
+    dart_path,
+    "--snapshot=" + rebase_path(dfe_snapshot),
+    "--snapshot-kind=app-jit",
+    "--packages=" + package_map,
+    dfe_script,
+    training_script,
+  ]
+}
+
 action("generate_snapshot_file") {
   deps = [
     ":generate_snapshot_bin",
   ]
 
   snapshot_in_cc_file = "snapshot_in.cc"
   inputs = [
     "../tools/create_snapshot_file.py",
     snapshot_in_cc_file,
     "$target_gen_dir/vm_isolate_snapshot.bin",
@@ skipping 344 matching lines @@
   ]
   if (is_linux || is_android) {
     cflags = [ "-fPIC" ]
   }
   if (is_win) {
     libs = [ "dart.lib" ]
     abs_root_out_dir = rebase_path(root_out_dir)
     ldflags = [ "/LIBPATH:$abs_root_out_dir" ]
   }
 }