Dart: Adds a program to create snapshots of Mojo apps.

mojo/dart/BUILD.gn

Index: mojo/dart/BUILD.gn
diff --git a/mojo/dart/BUILD.gn b/mojo/dart/BUILD.gn
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index 0000000000000000000000000000000000000000..20d0dacacc11fba5ba75fef8e48ebee7ff989c14
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+++ b/mojo/dart/BUILD.gn
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+# 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.
+
+group("dart") {
+  deps = [
+    "//mojo/dart/apptest",
+    "//mojo/dart/dart_snapshotter($host_toolchain)",
+    "//mojo/dart/mojom",
+    "//mojo/dart/mojo_services",
+    "//mojo/dart/observatory_test",
+  ]
+}