Reland: mash: Fix MusPropertyMirrorAsh for owned properties; add test.

ash/touch_hud/mus/BUILD.gn

 # Copyright 2016 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("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 source_set("lib") {
   sources = [
     "touch_hud_application.cc",
     "touch_hud_application.h",
   ]
 
   deps = [
-    "//ash/public/cpp",
+    "//ash/public/cpp:ash_public_cpp",
     "//ash/public/interfaces",
     "//ash/touch_hud",
     "//base",
     "//mash/public/interfaces",
     "//mojo/common",
     "//mojo/public/cpp/bindings",
     "//services/service_manager/public/cpp",
     "//services/service_manager/public/cpp:sources",
     "//services/ui/public/cpp",
     "//services/ui/public/interfaces",
@@ skipping 20 matching lines @@
     "//ui/views/mus:for_mojo_application",
   ]
 
   resources = [ "$root_out_dir/views_mus_resources.pak" ]
 }
 
 service_manifest("manifest") {
   name = "touch_hud"
   source = "manifest.json"
 }