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

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

Index: ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc b/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
index af00fe3ba0eb7cac5c1dd806bbf7715988ecf695..bfe65bbbdc9d2f5decc9dabf53451d736471da44 100644
--- a/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
+++ b/ui/ozone/platform/drm/gpu/drm_overlay_validator.cc
@@ -131,7 +131,10 @@ std::vector<OverlayCheck_Params> DrmOverlayValidator::TestPageFlip(
     gfx::Size scaled_buffer_size = GetScaledSize(
         overlay.buffer_size, overlay.display_rect, overlay.crop_rect);
 
-    uint32_t original_format = GetFourCCFormatForFramebuffer(overlay.format);
+    uint32_t original_format =
+        overlay.plane_z_order
+            ? GetFourCCFormatFromBufferFormat(overlay.format)
+            : GetFourCCFormatForOpaqueFramebuffer(overlay.format);
     scoped_refptr<ScanoutBuffer> buffer =
         GetBufferForPageFlipTest(drm, overlay.buffer_size, original_format,
                                  buffer_generator_, &reusable_buffers);