services/ui: Create a proper component for the client-lib.

services/ui/public/cpp/scoped_window_ptr.h

Index: services/ui/public/cpp/scoped_window_ptr.h
diff --git a/services/ui/public/cpp/scoped_window_ptr.h b/services/ui/public/cpp/scoped_window_ptr.h
index 2595ad14dfd52c603b4c6cc8a554c9b6dbca3770..7c6a3e70e716dca10efd4abc80e1ba13666ac04b 100644
--- a/services/ui/public/cpp/scoped_window_ptr.h
+++ b/services/ui/public/cpp/scoped_window_ptr.h
@@ -6,13 +6,14 @@
 #define SERVICES_UI_PUBLIC_CPP_SCOPED_WINDOW_PTR_H_
 
 #include "base/macros.h"
+#include "services/ui/public/cpp/ui_export.h"
 #include "services/ui/public/cpp/window_observer.h"
 
 namespace ui {
 
 // Wraps a Window, taking overship of the Window. Also deals with Window being
 // destroyed while ScopedWindowPtr still exists.
-class ScopedWindowPtr : public WindowObserver {
+class UI_EXPORT ScopedWindowPtr : public WindowObserver {
  public:
   explicit ScopedWindowPtr(Window* window);
   ~ScopedWindowPtr() override;