Start building core_services.mojo.

components/core_services/BUILD.gn

+# 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("//build/config/ui.gni")
+import("//third_party/mojo/src/mojo/public/mojo_application.gni")
+import("//testing/test.gni")
+
+# core_services should be thought of as a bundle of many of the services which
+# we ship with.
+mojo_native_application("core_services") {
+  sources = [
+    "core_services_application_delegate.cc",
+    "main.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//components/clipboard:lib",
+    "//mojo/application",
+    "//mojo/common",
+    "//mojo/environment:chromium",
+    "//third_party/mojo/src/mojo/public/interfaces/application",
+    "//third_party/mojo/src/mojo/public/cpp/bindings:bindings",
+  ]
+}