ozone: dri: add synchronous SwapBuffers support on surfaceless

ui/ozone/platform/dri/dri_surface.cc

Index: ui/ozone/platform/dri/dri_surface.cc
diff --git a/ui/ozone/platform/dri/dri_surface.cc b/ui/ozone/platform/dri/dri_surface.cc
index 8cbb2f9bc5fddb5265838fe8ab3c01b1105eda93..89107f2b2d8e308f2c4ff19d694b3c90ba718cda 100644
--- a/ui/ozone/platform/dri/dri_surface.cc
+++ b/ui/ozone/platform/dri/dri_surface.cc
@@ -73,7 +73,8 @@ void DriSurface::PresentCanvas(const gfx::Rect& damage) {
   controller->QueueOverlayPlane(OverlayPlane(buffers_[front_buffer_ ^ 1]));
 
   UpdateNativeSurface(damage);
-  controller->SchedulePageFlip(base::Bind(&base::DoNothing));
+  controller->SchedulePageFlip(false /* is_sync */,
+                               base::Bind(&base::DoNothing));
 
   // Update our front buffer pointer.
   front_buffer_ ^= 1;