Move some AX attrs from AXNodeData to AXTreeData.

ui/accessibility/ax_tree.h

Index: ui/accessibility/ax_tree.h
diff --git a/ui/accessibility/ax_tree.h b/ui/accessibility/ax_tree.h
index 78be5157ea593c6c146fb71775aeddb14ff139b6..134ddf6a7822587de5bfae742dc466eb2e64f2df 100644
--- a/ui/accessibility/ax_tree.h
+++ b/ui/accessibility/ax_tree.h
@@ -9,6 +9,8 @@
 
 #include "base/containers/hash_tables.h"
 #include "ui/accessibility/ax_export.h"
+#include "ui/accessibility/ax_node_data.h"
+#include "ui/accessibility/ax_tree_data.h"
 #include "ui/accessibility/ax_tree_update.h"
 
 namespace ui {
@@ -37,6 +39,9 @@ class AX_EXPORT AXTreeDelegate {
   AXTreeDelegate();
   virtual ~AXTreeDelegate();
 
+  // Called when tree data changes.
+  virtual void OnTreeDataChanged(AXTree* tree) = 0;
+
   // Called just before a node is deleted. Its id and data will be valid,
   // but its links to parents and children are invalid. This is called
   // in the middle of an update, the tree may be in an invalid state!
@@ -88,20 +93,24 @@ class AX_EXPORT AXTreeDelegate {
 class AX_EXPORT AXTree {
  public:
   AXTree();
-  explicit AXTree(const AXTreeUpdate<AXNodeData>& initial_state);
+  explicit AXTree(const AXTreeUpdate& initial_state);
   virtual ~AXTree();
 
   virtual void SetDelegate(AXTreeDelegate* delegate);
 
   AXNode* root() const { return root_; }
 
+  const AXTreeData& data() const { return data_; }
+
   // Returns the AXNode with the given |id| if it is part of this AXTree.
   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<AXNodeData>& update);
+  virtual bool Unserialize(const AXTreeUpdate& update);
+
+  virtual void UpdateData(const AXTreeData& data);
 
   // Return a multi-line indented string representation, for logging.
   std::string ToString() const;
@@ -149,6 +158,7 @@ class AX_EXPORT AXTree {
   AXNode* root_;
   base::hash_map<int32, AXNode*> id_map_;
   std::string error_;
+  AXTreeData data_;
 };
 
 }  // namespace ui