[Ozone-DRI] Listen for swap events

ui/ozone/platform/dri/gbm_surface.h

Index: ui/ozone/platform/dri/gbm_surface.h
diff --git a/ui/ozone/platform/dri/gbm_surface.h b/ui/ozone/platform/dri/gbm_surface.h
index 193fc591b7cd4343ab5ceb5e34f1108d13cb98b2..d0bb2bda0765836438a5aef93f55c45a1eb988f6 100644
--- a/ui/ozone/platform/dri/gbm_surface.h
+++ b/ui/ozone/platform/dri/gbm_surface.h
@@ -6,6 +6,7 @@
 #define UI_OZONE_PLATFORM_DRI_GBM_SURFACE_H_
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/ozone/platform/dri/gbm_surfaceless.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
@@ -40,6 +41,9 @@ class GbmSurface : public GbmSurfaceless {
   bool OnSwapBuffersAsync(const SwapCompletionCallback& callback) override;
 
  private:
+  void OnSwapBuffersCallback(const SwapCompletionCallback& callback,
+                             gbm_bo* pending_buffer);
+
   gbm_device* gbm_device_;
 
   DriWrapper* dri_;
@@ -52,6 +56,8 @@ class GbmSurface : public GbmSurfaceless {
 
   gfx::Size size_;
 
+  base::WeakPtrFactory<GbmSurface> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(GbmSurface);
 };