Connect mojom::DisplayController from ash to ui.

services/ui/display/platform_screen_stub.cc

Index: services/ui/display/platform_screen_stub.cc
diff --git a/services/ui/display/platform_screen_stub.cc b/services/ui/display/platform_screen_stub.cc
index 87580ab031c6a2ab75147546e6c51053402e521e..4b133dfbfbd2ba087a9a3ca9d3c9dc2fd5764dd1 100644
--- a/services/ui/display/platform_screen_stub.cc
+++ b/services/ui/display/platform_screen_stub.cc
@@ -10,6 +10,7 @@
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "services/shell/public/cpp/interface_registry.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace display {
@@ -32,6 +33,8 @@ void PlatformScreenStub::FixedSizeScreenConfiguration() {
   delegate_->OnDisplayAdded(kDisplayId, gfx::Rect(1024, 768));
 }
 
+void PlatformScreenStub::AddInterfaces(shell::InterfaceRegistry* registry) {}
+
 void PlatformScreenStub::Init(PlatformScreenDelegate* delegate) {
   DCHECK(delegate);
   delegate_ = delegate;