Try |View::HandleAccessibleAction| before falling back to fixed actions.

ui/views/accessibility/ax_view_obj_wrapper.cc

Index: ui/views/accessibility/ax_view_obj_wrapper.cc
diff --git a/ui/views/accessibility/ax_view_obj_wrapper.cc b/ui/views/accessibility/ax_view_obj_wrapper.cc
index 75d7545ddade96f7ddd35c9b7174cdedcee1a212..4ccf13027bd36aafa33f298f18102911c7ff2e3a 100644
--- a/ui/views/accessibility/ax_view_obj_wrapper.cc
+++ b/ui/views/accessibility/ax_view_obj_wrapper.cc
@@ -5,7 +5,7 @@
 #include "ui/views/accessibility/ax_view_obj_wrapper.h"
 
 #include "base/strings/utf_string_conversions.h"
-#include "ui/accessibility/ax_node_data.h"
+#include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/events/event_utils.h"
 #include "ui/views/accessibility/ax_aura_obj_cache.h"
@@ -91,4 +91,8 @@ void AXViewObjWrapper::ShowContextMenu() {
                          ui::MENU_SOURCE_KEYBOARD);
 }
 
+bool AXViewObjWrapper::HandleAccessibleAction(const ui::AXActionData& action) {
+  return view_->HandleAccessibleAction(action);
+}
+
 }  // namespace views