namespace Internal
{
-bool LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec = false;
+class LayoutData;
+bool LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec = false;
+LayoutData* LayoutItem::Impl::sLayoutData = nullptr;
LayoutItem::Impl::Impl()
: mOwner( nullptr ),