Dart: Adds a content handler and a test.

services/dart/BUILD.gn

+# Copyright 2014 The Dart project 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/mojo_application.gni")
+
+group("dart") {
+  deps = [
+    ":dart_content_handler",
+  ]
+}
+
+mojo_native_application("dart_content_handler") {
+  sources = [
+    "content_handler_main.cc",
+    "dart_app.cc",
+    "dart_app.h",
+  ]
+
+  deps = [
+    "//base",
+    "//base:i18n",
+    "//crypto",
+    "//dart/runtime:libdart",
+    "//mojo/application",
+    "//mojo/application:application",
+    "//mojo/application:content_handler",
+    "//mojo/dart/embedder:dart_controller",
+    "//mojo/common",
+    "//mojo/environment:chromium",
+    "//mojo/public/cpp/system",
+    "//mojo/public/cpp/utility",
+    "//mojo/public/interfaces/application",
+    "//mojo/services/content_handler/public/interfaces",
+    "//mojo/services/network/public/interfaces",
+  ]
+}
+
+mojo_native_application("dart_apptests") {
+  testonly = true
+
+  sources = [
+    "echo_apptest.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//mojo/application",
+    "//mojo/application:test_support",
+    "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/system",
+    "//services/dart/test:echo_service",
+  ]
+}