Impl mus::mojom::GpuService to enable using Chrome IPC version gpu CmdBuf in mus

components/mus/public/cpp/scoped_window_ptr.h

Index: components/mus/public/cpp/scoped_window_ptr.h
diff --git a/components/mus/public/cpp/scoped_window_ptr.h b/components/mus/public/cpp/scoped_window_ptr.h
index b94e0f945f3cfdf950e383f5b42d1b35d7bf2cf3..c6023e8cc779a63ede5c9befc080a199c9eddf2b 100644
--- a/components/mus/public/cpp/scoped_window_ptr.h
+++ b/components/mus/public/cpp/scoped_window_ptr.h
@@ -6,13 +6,14 @@
 #define COMPONENTS_MUS_PUBLIC_CPP_SCOPED_WINDOW_PTR_H_
 
 #include "base/macros.h"
+#include "components/mus/public/cpp/mus_public_export.h"
 #include "components/mus/public/cpp/window_observer.h"
 
 namespace mus {
 
 // Wraps a Window, taking overship of the Window. Also deals with Window being
 // destroyed while ScopedWindowPtr still exists.
-class ScopedWindowPtr : public WindowObserver {
+class MUS_PUBLIC_EXPORT ScopedWindowPtr : public WindowObserver {
  public:
   explicit ScopedWindowPtr(Window* window);
   ~ScopedWindowPtr() override;