cc: Allow overlay candidates with transforms.

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

Index: ui/ozone/platform/drm/gpu/hardware_display_plane_manager_legacy.cc
diff --git a/ui/ozone/platform/drm/gpu/hardware_display_plane_manager_legacy.cc b/ui/ozone/platform/drm/gpu/hardware_display_plane_manager_legacy.cc
index e4120764274591a4be73989f15a85e2c0b511e97..501dfabcf6dcc702ee531bcc1352f0204493e0c3 100644
--- a/ui/ozone/platform/drm/gpu/hardware_display_plane_manager_legacy.cc
+++ b/ui/ozone/platform/drm/gpu/hardware_display_plane_manager_legacy.cc
@@ -105,6 +105,9 @@ bool HardwareDisplayPlaneManagerLegacy::SetPlaneData(
     uint32_t crtc_id,
     const gfx::Rect& src_rect,
     CrtcController* crtc) {
+  // Legacy modesetting rejects transforms.
+  if (overlay.plane_transform != gfx::OVERLAY_TRANSFORM_NONE)
+    return false;
   if ((hw_plane->type() == HardwareDisplayPlane::kDummy) ||
       plane_list->legacy_page_flips.empty() ||
       plane_list->legacy_page_flips.back().crtc_id != crtc_id) {