ozone: Add an opaque fb to ScanoutBuffer for primary planes.

ui/ozone/platform/drm/gpu/screen_manager.cc

Index: ui/ozone/platform/drm/gpu/screen_manager.cc
diff --git a/ui/ozone/platform/drm/gpu/screen_manager.cc b/ui/ozone/platform/drm/gpu/screen_manager.cc
index 09e9b425728eedb9df82d050c069779659b8c555..881188e06111536d5e675855a956e077206692a8 100644
--- a/ui/ozone/platform/drm/gpu/screen_manager.cc
+++ b/ui/ozone/platform/drm/gpu/screen_manager.cc
@@ -345,7 +345,7 @@ OverlayPlane ScreenManager::GetModesetBuffer(
 
   gfx::BufferFormat format = display::DisplaySnapshot::PrimaryFormat();
   scoped_refptr<DrmDevice> drm = controller->GetAllocationDrmDevice();
-  uint32_t fourcc_format = ui::GetFourCCFormatForFramebuffer(format);
+  uint32_t fourcc_format = ui::GetFourCCFormatForOpaqueFramebuffer(format);
   scoped_refptr<ScanoutBuffer> buffer =
       buffer_generator_->Create(drm, fourcc_format, bounds.size());
   if (!buffer) {