IsInternalDisplayId  576 ash/display/display_manager.cc       internal_display_connected = IsInternalDisplayId(iter->id());
IsInternalDisplayId  131 ash/display/display_manager.h   bool IsInternalDisplayId(int64 id) const;
IsInternalDisplayId   93 ash/system/chromeos/tray_display.cc       display_manager->IsInternalDisplayId(
IsInternalDisplayId  246 ash/system/chromeos/tray_display.cc         !display_manager->IsInternalDisplayId(primary_id)) {