Reland: Introduce the devices Mojo app

device/devices_app/main.cc

Index: device/devices_app/main.cc
diff --git a/mandoline/services/core_services/main.cc b/device/devices_app/main.cc
similarity index 73%
copy from mandoline/services/core_services/main.cc
copy to device/devices_app/main.cc
index ef8c8477a0e3a8494fbc3061219c48742719dd3b..e82edb34e917478a4380240f82a2eff916ccd1f9 100644
--- a/mandoline/services/core_services/main.cc
+++ b/device/devices_app/main.cc
@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mandoline/services/core_services/core_services_application_delegate.h"
+#include "base/sequenced_task_runner.h"
+#include "device/devices_app/devices_app.h"
 #include "mojo/application/public/cpp/application_runner.h"
 #include "third_party/mojo/src/mojo/public/c/system/main.h"
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunner runner(
-      new core_services::CoreServicesApplicationDelegate);
+      device::DevicesApp::CreateDelegate(nullptr).release());
   return runner.Run(shell_handle);
 }