Create an apptesting framework for dart.

third_party/dart-packages/unittest/BUILD.gn

Index: third_party/dart-packages/unittest/BUILD.gn
diff --git a/third_party/dart-packages/unittest/BUILD.gn b/third_party/dart-packages/unittest/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..fbf6abc9fd68a2b5986eb4e653c4daf4e9a8dfa6
--- /dev/null
+++ b/third_party/dart-packages/unittest/BUILD.gn
@@ -0,0 +1,29 @@
+# Copyright 2015 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/dart/rules.gni")
+
+dart_package("unittest") {
+  sources = [
+    "unittest/compact_vm_config.dart",
+    "unittest/html_config.dart",
+    "unittest/html_enhanced_config.dart",
+    "unittest/html_individual_config.dart",
+    "unittest/unittest.dart",
+    "unittest/vm_config.dart",
+    "unittest/src/configuration.dart",
+    "unittest/src/expected_function.dart",
+    "unittest/src/group_context.dart",
+    "unittest/src/internal_test_case.dart",
+    "unittest/src/simple_configuration.dart",
+    "unittest/src/test_case.dart",
+    "unittest/src/test_environment.dart",
+    "unittest/src/utils.dart",
+  ]
+  deps = [
+    "//third_party/dart-packages/matcher",
+    "//third_party/dart-packages/path",
+    "//third_party/dart-packages/stack_trace",
+  ]
+}