Implemented the "aria-current" state on Windows.

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 299 matching lines @@
     // Identifies a child tree which this node hosts.
     child_tree_id,
 
     // Position or Number of items in current set of listitems or treeitems
     set_size,
     pos_in_set,
 
     // In the case of AX_ROLE_COLOR_WELL, specifies the selected color.
     color_value,
 
+    // Indicates the element that represents the current item within a container
+    // or set of related elements.
+    aria_current_state,
+
     // Text attributes.
 
     // Foreground and background color in RGBA.
     background_color,
     color,
 
     // Indicates if a form control has invalid input or
     // if an element has an aria-invalid attribute.
     invalid_state,
 
@@ skipping 88 matching lines @@
 
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.ui.accessibility
   [cpp_enum_prefix_override="ax"] enum AXTextStyle {
     text_style_bold  = 1,
     text_style_italic = 2,
     text_style_underline = 4,
     text_style_line_through = 8
   };
 
+  [cpp_enum_prefix_override="ax"] enum AXAriaCurrentState {
+    aria_current_state_false,
+    aria_current_state_true,
+    aria_current_state_page,
+    aria_current_state_step,
+    aria_current_state_location,
+    aria_current_state_date,
+    aria_current_state_time
+  };
+
   [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,
@@ skipping 12 matching lines @@
   };
 
   [cpp_enum_prefix_override="ax"] enum AXDescriptionFrom {
     description_from_uninitialized = 0,
     description_from_attribute,
     description_from_contents,
     description_from_placeholder,
     description_from_related_element
   };
 };