alternative tracing

ui/gfx/render_text_mac.h

Index: ui/gfx/render_text_mac.h
diff --git a/ui/gfx/render_text_mac.h b/ui/gfx/render_text_mac.h
index 99475778d17169d111836dd2905fe09456d52695..539166793f31730a9ff2f257cc1ec614f23a2af6 100644
--- a/ui/gfx/render_text_mac.h
+++ b/ui/gfx/render_text_mac.h
@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "base/mac/scoped_cftyperef.h"
+#include "ui/gfx/gfx_export.h"
 #include "ui/gfx/render_text.h"
 
 namespace gfx {
@@ -20,7 +21,7 @@ namespace gfx {
 //
 // Note: The current implementation only supports drawing and sizing the text,
 //       but not text selection or cursor movement.
-class RenderTextMac : public RenderText {
+class GFX_EXPORT RenderTextMac : public RenderText {
  public:
   RenderTextMac();
   ~RenderTextMac() override;