Add a treeChange type to Automation

ui/accessibility/ax_tree.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_ACCESSIBILITY_AX_TREE_H_
 #define UI_ACCESSIBILITY_AX_TREE_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 44 matching lines @@
   virtual void OnSubtreeWillBeDeleted(AXTree* tree, AXNode* node) = 0;
 
   // Called immediately after a new node is created. The tree may be in
   // the middle of an update, don't walk the parents and children now.
   virtual void OnNodeCreated(AXTree* tree, AXNode* node) = 0;
 
   // Called when a node changes its data or children. The tree may be in
   // the middle of an update, don't walk the parents and children now.
   virtual void OnNodeChanged(AXTree* tree, AXNode* node) = 0;
 
-  enum ChangeType {
-    NODE_CREATED,
-    SUBTREE_CREATED,
-    NODE_CHANGED
-  };
+  enum ChangeType { NODE_CREATED, SUBTREE_CREATED, NODE_CHANGED, TEXT_CHANGED };
 
   struct Change {
     Change(AXNode* node, ChangeType type) {
       this->node = node;
       this->type = type;
     }
     AXNode* node;
     ChangeType type;
   };
 
@@ skipping 79 matching lines @@
   AXTreeDelegate* delegate_;
   AXNode* root_;
   base::hash_map<int32_t, AXNode*> id_map_;
   std::string error_;
   AXTreeData data_;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_TREE_H_