Refactor content/ to use ui::AXNodeData instead of blink.

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 <set>
 
 #include "base/containers/hash_tables.h"
@@ skipping 17 matching lines @@
   virtual ~AXTree();
 
   virtual AXNode* GetRoot() const;
   virtual AXNode* GetFromId(int32 id) const;
 
   // Returns true on success. If it returns false, it's a fatal error
   // and this tree should be destroyed, and the source of the tree update
   // should not be trusted any longer.
   virtual bool Unserialize(const AXTreeUpdate& update);
 
+  // Return a multi-line indented string representation, for logging.
+  std::string ToString() const;
+
   // A string describing the error from an unsuccessful Unserialize,
   // for testing and debugging.
   const std::string& error() { return error_; }
 
  protected:
   // Subclasses can override this to use a subclass of AXNode.
   virtual AXNode* CreateNode(AXNode* parent, int32 id, int32 index_in_parent);
 
   // This is called from within Unserialize(), it returns true on success.
   // Subclasses can override this to do additional processing. |pending_nodes|
@@ skipping 33 matching lines @@
                             std::set<AXNode*>* pending_nodes);
 
   AXNode* root_;
   base::hash_map<int32, AXNode*> id_map_;
   std::string error_;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_TREE_H_