Reify view ownership as a message pipe.

services/ui/view_manager/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("//mojo/public/mojo_application.gni")
 import("//testing/test.gni")
 
 mojo_native_application("view_manager") {
   output_name = "view_manager_service"
 
   sources = [
     "main.cc",
     "view_associate_table.cc",
     "view_associate_table.h",
     "view_host_impl.cc",
     "view_host_impl.h",
     "view_layout_request.cc",
     "view_layout_request.h",
     "view_manager_app.cc",
     "view_manager_app.h",
     "view_manager_impl.cc",
     "view_manager_impl.h",
     "view_registry.cc",
     "view_registry.h",
     "view_state.cc",
     "view_state.h",
+    "view_stub.cc",
+    "view_stub.h",
     "view_tree_host_impl.cc",
     "view_tree_host_impl.h",
     "view_tree_state.cc",
     "view_tree_state.h",
   ]
 
   deps = [
     "//base",
     "//mojo/application",
     "//mojo/common",
     "//mojo/common:tracing_impl",
     "//mojo/converters/geometry",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings:bindings",
     "//mojo/services/geometry/cpp",
     "//mojo/services/gfx/composition/cpp",
     "//mojo/services/gfx/composition/interfaces",
     "//mojo/services/ui/views/cpp",
     "//mojo/services/ui/views/interfaces",
   ]
 }