Added the aria-sort state to the accessibility tree.

ui/accessibility/ax_enums.idl

 // Copyright 2014 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.
 
 // These should be kept in sync with third_party/WebKit/public/web/WebAXEnums.h
 // until the Chromium and Blink trees are merged.
 [camel_case_enum_to_string=true] namespace ui {
 
   // For new entries to the following three enums, also add to
   // chrome/common/extensions/api/automation.idl.
@@ skipping 261 matching lines @@
 
     // Table column attributes.
     table_column_index,
     table_column_header_id,
 
     // Table cell attributes.
     table_cell_column_index,
     table_cell_column_span,
     table_cell_row_index,
     table_cell_row_span,
+    sort_direction,
 
     // Tree control attributes.
     hierarchical_level,
 
     // Relationships between this element and other elements.
     title_ui_element,
     activedescendant_id,
 
     // Color value for AX_ROLE_COLOR_WELL, each component is 0..255
     color_value_red,
@@ skipping 108 matching lines @@
   };
 
   [cpp_enum_prefix_override="ax"] enum AXInvalidState {
     invalid_state_false,
     invalid_state_true,
     invalid_state_spelling,
     invalid_state_grammar,
     invalid_state_other
   };
 
+  [cpp_enum_prefix_override="ax"] enum AXSortDirection {
+    sort_direction_unsorted,
+    sort_direction_ascending,
+    sort_direction_descending,
+    sort_direction_other
+  };
+
 };