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

services/ui/public/cpp/window.h

Index: services/ui/public/cpp/window.h
diff --git a/services/ui/public/cpp/window.h b/services/ui/public/cpp/window.h
index fc5efd9eb419511e94ebba6c6767a080399af3c9..411b1d44385974fd697033f9d69c03fdb175dd33 100644
--- a/services/ui/public/cpp/window.h
+++ b/services/ui/public/cpp/window.h
@@ -14,6 +14,7 @@
 #include "mojo/public/cpp/bindings/array.h"
 #include "services/shell/public/interfaces/interface_provider.mojom.h"
 #include "services/ui/common/types.h"
+#include "services/ui/public/cpp/ui_export.h"
 #include "services/ui/public/interfaces/mus_constants.mojom.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 #include "ui/gfx/geometry/insets.h"
@@ -47,7 +48,7 @@ struct WindowProperty;
 // TODO(beng): Right now, you'll have to implement a WindowObserver to track
 //             destruction and NULL any pointers you have.
 //             Investigate some kind of smart pointer or weak pointer for these.
-class Window {
+class UI_EXPORT Window {
  public:
   using Children = std::vector<Window*>;
   using EmbedCallback = base::Callback<void(bool)>;