Set the owner of the element. The owner will be propagated to all the descendants of this element.
The owner manages the dirty elements list.
The WidgetsBinding introduces the primary owner,
WidgetsBinding.buildOwner, and assigns it to the widget tree in the call
to runApp. The binding is responsible for driving the build pipeline by
calling the build owner's BuildOwner.buildScope method. See
WidgetsBinding.beginFrame.
Source
void assignOwner(BuildOwner owner) {
_owner = owner;
}