Add a treeChange type to Automation

ui/accessibility/ax_tree_unittest.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/accessibility/ax_node.h"
 #include "ui/accessibility/ax_serializable_tree.h"
 #include "ui/accessibility/ax_tree.h"
 #include "ui/accessibility/ax_tree_serializer.h"
 
 namespace ui {
 
 namespace {
 
 class FakeAXTreeDelegate : public AXTreeDelegate {
  public:
   FakeAXTreeDelegate()
       : tree_data_changed_(false),
         root_changed_(false) {}
 
+  void OnNodeDataWillChange(AXTree* tree,
+                            const AXNodeData& old_node_data,
+                            const AXNodeData& new_node_data) override {}
   void OnTreeDataChanged(AXTree* tree) override {
     tree_data_changed_ = true;
   }
 
   void OnNodeWillBeDeleted(AXTree* tree, AXNode* node) override {
     deleted_ids_.push_back(node->id());
   }
 
   void OnSubtreeWillBeDeleted(AXTree* tree, AXNode* node) override {
     subtree_deleted_ids_.push_back(node->id());
@@ skipping 356 matching lines @@
   tree_data_update.has_tree_data = true;
   tree_data_update.tree_data.title = "New Title";
   EXPECT_TRUE(tree.Unserialize(tree_data_update));
   EXPECT_TRUE(fake_delegate.tree_data_changed());
   EXPECT_EQ("New Title", tree.data().title);
 
   tree.SetDelegate(NULL);
 }
 
 }  // namespace ui