GN rules for everything in //mojo

mojo/apps/js/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/system.gni")
+
+shared_library("mojo_js") {
+  sources = [
+    "main.cc"
+  ]
+
+  deps = [
+    ":js",
+  ] + mojo_system_for_shared_library
+}
+
 # GYP version: part of mojo/mojo_apps.gypi:mojo_js_lib
 source_set("js") {
   deps = [
     "//base",
     "//gin",
     "//mojo/apps/js/bindings",
     "//mojo/apps/js/bindings/gl",
     "//mojo/bindings/js",
   ]
   sources = [
     "mojo_runner_delegate.cc",
     "mojo_runner_delegate.h",
   ]
 }