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

components/mus/public/cpp/window_surface.h

Index: components/mus/public/cpp/window_surface.h
diff --git a/components/mus/public/cpp/window_surface.h b/components/mus/public/cpp/window_surface.h
index 6fa60a7d8ec6dfa59fbaf540fd305f75339a3b2c..6542d46e1835c8afcd802cd2adaff42639cc9e9b 100644
--- a/components/mus/public/cpp/window_surface.h
+++ b/components/mus/public/cpp/window_surface.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
+#include "components/mus/public/cpp/mus_public_export.h"
 #include "components/mus/public/interfaces/compositor_frame.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/interface_ptr_info.h"
@@ -22,7 +23,7 @@ class Window;
 
 // A WindowSurface is wrapper to simplify submitting CompositorFrames to
 // Windows, and receiving ReturnedResources.
-class WindowSurface : public mojom::SurfaceClient {
+class MUS_PUBLIC_EXPORT WindowSurface : public mojom::SurfaceClient {
  public:
   // static
   static std::unique_ptr<WindowSurface> Create(
@@ -62,7 +63,7 @@ class WindowSurface : public mojom::SurfaceClient {
 // A WindowSurfaceBinding is a bundle of mojo interfaces that are to be used by
 // or implemented by the Mus window server when passed into
 // Window::AttachSurface. WindowSurfaceBinding has no standalone functionality.
-class WindowSurfaceBinding {
+class MUS_PUBLIC_EXPORT WindowSurfaceBinding {
  public:
   ~WindowSurfaceBinding();