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

services/ui/public/cpp/raster_thread_helper.h

Index: services/ui/public/cpp/raster_thread_helper.h
diff --git a/services/ui/public/cpp/raster_thread_helper.h b/services/ui/public/cpp/raster_thread_helper.h
index 8db3e658de9d6b2f01a59bf9dd395d2cedc88dc1..463f5058dd217fe93376a1cad7571c0eaafa3aa7 100644
--- a/services/ui/public/cpp/raster_thread_helper.h
+++ b/services/ui/public/cpp/raster_thread_helper.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "services/ui/public/cpp/ui_export.h"
 
 namespace cc {
 class TaskGraphRunner;
@@ -16,7 +17,7 @@ class SingleThreadTaskGraphRunner;
 
 namespace ui {
 
-class RasterThreadHelper {
+class UI_EXPORT RasterThreadHelper {
  public:
   RasterThreadHelper();
   ~RasterThreadHelper();