gen_snapshot now generates two snapshot buffers, one for the vm isolate

mojo/dart/embedder/test/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 action("generate_test_snapshot_bin") {
   deps = [
     "//dart/runtime/bin:gen_snapshot($host_toolchain)",
   ]
   inputs = [
     "test_snapshot.dart",
     "//dart/runtime/tools/create_snapshot_bin.py",
     "//mojo/dart/embedder/builtin.dart",
     "//mojo/public/dart/internal.dart",
     "//mojo/public/dart/src/handle_watcher.dart",
     "//mojo/public/dart/src/natives.dart",
     "//mojo/public/dart/src/timer_queue.dart",
   ]
-  output = "$target_gen_dir/test_snapshot_gen.bin"
+  test_vm_isolate_snapshot = "$target_gen_dir/test_vm_isolate_snapshot.bin"
+  test_isolate_snapshot = "$target_gen_dir/test_isolate_snapshot.bin"
   outputs = [
-    output,
+    test_vm_isolate_snapshot,
+    test_isolate_snapshot,
   ]
 
   gen_snapshot_dir =
       get_label_info("//dart/runtime/bin:gen_snapshot($host_toolchain)",
                      "root_out_dir")
   script = "//dart/runtime/tools/create_snapshot_bin.py"
   builtin_path = rebase_path("//mojo/dart/embedder/builtin.dart")
   internal_path = rebase_path("//mojo/public/dart/internal.dart")
   args = [
     "--executable",
     rebase_path("$gen_snapshot_dir/gen_snapshot"),
     "--package_root",
     rebase_path("$root_gen_dir"),
     "--script",
     rebase_path("test_snapshot.dart"),
+    "--vm_output_bin",
+    rebase_path(test_vm_isolate_snapshot, root_build_dir),
     "--output_bin",
-    rebase_path(output, root_build_dir),
+    rebase_path(test_isolate_snapshot, root_build_dir),
     "--target_os",
     os,
     "--url_mapping=dart:mojo.builtin,$builtin_path",
     "--url_mapping=dart:mojo.internal,$internal_path",
   ]
 }
 
 action("generate_test_snapshot_file") {
   deps = [
     ":generate_test_snapshot_bin",
   ]
   inputs = [
     "//dart/runtime/tools/create_snapshot_file.py",
     "//mojo/dart/embedder/snapshot.cc.tmpl",
-    "$target_gen_dir/test_snapshot_gen.bin",
+    "$target_gen_dir/test_vm_isolate_snapshot.bin",
+    "$target_gen_dir/test_isolate_snapshot.bin",
   ]
   output = "$target_gen_dir/test_snapshot.cc"
   outputs = [
     output,
   ]
 
   script = "//dart/runtime/tools/create_snapshot_file.py"
   args = [
+    "--vm_input_bin",
+    rebase_path("$target_gen_dir/test_vm_isolate_snapshot.bin"),
     "--input_bin",
-    rebase_path("$target_gen_dir/test_snapshot_gen.bin"),
+    rebase_path("$target_gen_dir/test_isolate_snapshot.bin"),
     "--input_cc",
     rebase_path("//mojo/dart/embedder/snapshot.cc.tmpl"),
     "--output",
     rebase_path(output),
   ]
 }
 
 # These go into the generated source directory for embedder tests.
 copy("copy_dart_mojo_sdk") {
   sources = [
@@ skipping 105 matching lines @@
     "//mojo/public/interfaces/bindings/tests:test_interfaces",
     "//testing/gtest",
   ]
 }
 
 mojom("dart_to_cpp_bindings") {
   sources = [
     "dart_to_cpp.mojom",
   ]
 }