Automatically fire AX events on Mac based on tree changes

ui/accessibility/platform/test_ax_node_wrapper.cc

Index: ui/accessibility/platform/test_ax_node_wrapper.cc
diff --git a/ui/accessibility/platform/test_ax_node_wrapper.cc b/ui/accessibility/platform/test_ax_node_wrapper.cc
index 28cd793796caf71e1b30d7180746553a25dfd297..10ab594ecd45b83d94068432ee58f52d8066820b 100644
--- a/ui/accessibility/platform/test_ax_node_wrapper.cc
+++ b/ui/accessibility/platform/test_ax_node_wrapper.cc
@@ -23,7 +23,9 @@ class TestAXTreeDelegate : public AXTreeDelegate {
   void OnNodeDataWillChange(AXTree* tree,
                             const AXNodeData& old_node_data,
                             const AXNodeData& new_node_data) override {}
-  void OnTreeDataChanged(AXTree* tree) override {}
+  void OnTreeDataChanged(AXTree* tree,
+                         const ui::AXTreeData& old_data,
+                         const ui::AXTreeData& new_data) override {}
   void OnNodeWillBeDeleted(AXTree* tree, AXNode* node) override {
     auto iter = g_node_to_wrapper_map.find(node);
     if (iter != g_node_to_wrapper_map.end()) {