Bug 1780878: [Part 1] Cache CONTROLLED_BY and CONTROLLER_FOR relations r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D152578

accessible/base/CacheConstants.h

@@ -69,6 +69,10 @@ static constexpr RelationData kRelationTypeAtoms[] = {
      RelationType::LABEL_FOR},
     {nsGkAtoms::_for, nsGkAtoms::label, RelationType::LABEL_FOR,
      RelationType::LABELLED_BY},
+    {nsGkAtoms::aria_controls, nullptr, RelationType::CONTROLLER_FOR,
+     RelationType::CONTROLLED_BY},
+    {nsGkAtoms::_for, nsGkAtoms::output, RelationType::CONTROLLED_BY,
+     RelationType::CONTROLLER_FOR},
 };
 
 }  // namespace a11y