Add an end-to-end test that excercises Mojo with a sandbox.

content/common/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/common/common.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 if (is_mac) {
@@ skipping 510 matching lines @@
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "application_setup.mojom",
     "background_sync_service.mojom",
     "geolocation_service.mojom",
     "image_downloader/image_downloader.mojom",
     "leveldb_wrapper.mojom",
+    "mojo_test.mojom",
     "permission_service.mojom",
     "presentation/presentation_service.mojom",
     "process_control.mojom",
     "render_frame_setup.mojom",
     "render_widget_window_tree_client_factory.mojom",
     "service_port_service.mojom",
     "service_worker/embedded_worker_setup.mojom",
     "storage_partition_service.mojom",
     "vr_service.mojom",
     "wake_lock_service.mojom",
   ]
 
   import_dirs = [ "//mojo/services" ]
 
   typemaps = [ "//url/mojo/origin.typemap" ]
   typemap_deps = [ "//url/mojo:url_mojom" ]
 
   public_deps = [
     "//components/leveldb/public/interfaces",
     "//components/mus/public/interfaces",
     "//content/public/common:mojo_bindings",
     "//mojo/shell/public/interfaces",
     "//skia/public/interfaces",
     "//third_party/WebKit/public:mojo_bindings",
     "//ui/mojo/geometry:interfaces",
   ]
 }