Move some AX attrs from AXNodeData to AXTreeData.

ui/accessibility/ax_tree_data.h

Index: ui/accessibility/ax_tree_data.h
diff --git a/ui/accessibility/ax_tree_data.h b/ui/accessibility/ax_tree_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..fa1bdb15264a8113932b1983375298b5ac6164ec
--- /dev/null
+++ b/ui/accessibility/ax_tree_data.h
@@ -0,0 +1,60 @@
+// Copyright 2015 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_DATA_H_
+#define UI_ACCESSIBILITY_AX_TREE_DATA_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/strings/string16.h"
+#include "base/strings/string_split.h"
+#include "ui/accessibility/ax_enums.h"
+#include "ui/accessibility/ax_export.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ui {
+
+// The data associated with an accessibility tree that's global to the
+// tree and not associated with any particular node in the tree.
+struct AX_EXPORT AXTreeData {
+  AXTreeData();
+  virtual ~AXTreeData();
+
+  // Return a string representation of this data, for debugging.
+  virtual std::string ToString() const;
+
+  // This is a simple serializable struct. All member variables should be
+  // public and copyable.
+
+  // The globally unique ID of this accessibility tree.
+  int32 tree_id;
+
+  // The ID of the accessibility tree that this tree is contained in, if any.
+  int32 parent_tree_id;
+
+  // Attributes specific to trees that are web frames.
+  std::string url;
+  std::string title;
+  std::string mimetype;
+  std::string doctype;
+  bool loaded;
+  float loading_progress;
+
+  // The current text selection within this tree, if any, expressed as the
+  // node ID and character offset of the anchor (selection start) and focus
+  // (selection end).
+  int32 sel_anchor_object_id;
+  int32 sel_anchor_offset;
+  int32 sel_focus_object_id;
+  int32 sel_focus_offset;
+};
+
+AX_EXPORT bool operator==(const AXTreeData& lhs, const AXTreeData& rhs);
+AX_EXPORT bool operator!=(const AXTreeData& lhs, const AXTreeData& rhs);
+
+}  // namespace ui
+
+#endif  // UI_ACCESSIBILITY_AX_TREE_DATA_H_