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

components/mus/public/cpp/window_tree_host_factory.h

Index: components/mus/public/cpp/window_tree_host_factory.h
diff --git a/components/mus/public/cpp/window_tree_host_factory.h b/components/mus/public/cpp/window_tree_host_factory.h
index 5090db32c6462a6a7bc9a98619edc2586013d12c..71eb8e4da20e544dfc8520a4b8f322a3e2e450a9 100644
--- a/components/mus/public/cpp/window_tree_host_factory.h
+++ b/components/mus/public/cpp/window_tree_host_factory.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 
+#include "components/mus/public/cpp/mus_public_export.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 #include "components/mus/public/interfaces/window_tree_host.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
@@ -23,14 +24,16 @@ class WindowTreeDelegate;
 // The following create a new window tree host. Supply a |factory| if you have
 // already connected to mus, otherwise supply |shell|, which contacts mus and
 // obtains a WindowTreeHostFactory.
-void CreateWindowTreeHost(mojom::WindowTreeHostFactory* factory,
-                          WindowTreeDelegate* delegate,
-                          mojom::WindowTreeHostPtr* host,
-                          WindowManagerDelegate* window_manager_delegate);
-void CreateWindowTreeHost(shell::Connector* connector,
-                          WindowTreeDelegate* delegate,
-                          mojom::WindowTreeHostPtr* host,
-                          WindowManagerDelegate* window_manager_delegate);
+void MUS_PUBLIC_EXPORT
+CreateWindowTreeHost(mojom::WindowTreeHostFactory* factory,
+                     WindowTreeDelegate* delegate,
+                     mojom::WindowTreeHostPtr* host,
+                     WindowManagerDelegate* window_manager_delegate);
+void MUS_PUBLIC_EXPORT
+CreateWindowTreeHost(shell::Connector* connector,
+                     WindowTreeDelegate* delegate,
+                     mojom::WindowTreeHostPtr* host,
+                     WindowManagerDelegate* window_manager_delegate);
 
 }  // namespace mus