Implemented the "aria-current" state on Windows.

content/renderer/accessibility/blink_ax_enum_conversion.h

 // Copyright (c) 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 CONTENT_RENDERER_ACCESSIBILITY_BLINK_AX_ENUM_CONVERSION_H_
 #define CONTENT_RENDERER_ACCESSIBILITY_BLINK_AX_ENUM_CONVERSION_H_
 
 #include <stdint.h>
 
 #include "third_party/WebKit/public/web/WebAXObject.h"
 #include "ui/accessibility/ax_enums.h"
 
 namespace content {
 
 // Convert a Blink WebAXRole to an AXRole defined in ui/accessibility.
 ui::AXRole AXRoleFromBlink(blink::WebAXRole role);
 
 // Convert a Blink WebAXEvent to an AXEvent defined in ui/accessibility.
 ui::AXEvent AXEventFromBlink(blink::WebAXEvent event);
 
 // Provides a conversion between the WebAXObject state
 // accessors and a state bitmask stored in an AXNodeData.
 // (Note that some rare states are sent as boolean attributes
 // in AXNodeData instead.)
 uint32_t AXStateFromBlink(const blink::WebAXObject& o);
 
-// Convert a Blink WebAXTextDirection to an AXTextDirection defined in
-// ui/accessibility.
 ui::AXTextDirection AXTextDirectionFromBlink(
     blink::WebAXTextDirection text_direction);
 
 ui::AXTextStyle AXTextStyleFromBlink(blink::WebAXTextStyle text_style);
 
-// Convert a Blink WebAXInvalidState to an AXInvalidState defined in
-// ui/accessibility.
+ui::AXAriaCurrentState AXAriaCurrentStateFromBlink(
+    blink::WebAXAriaCurrentState aria_current_state);
+
 ui::AXInvalidState AXInvalidStateFromBlink(
     blink::WebAXInvalidState invalid_state);
 
-// Convert a Blink WebAXSortDirection to an AXSortDirection defined in
-// ui/accessibility.
 ui::AXSortDirection AXSortDirectionFromBlink(
     blink::WebAXSortDirection sort_direction);
 
 ui::AXNameFrom AXNameFromFromBlink(blink::WebAXNameFrom name_from);
 
 ui::AXDescriptionFrom AXDescriptionFromFromBlink(
     blink::WebAXDescriptionFrom description_from);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ACCESSIBILITY_BLINK_AX_ENUM_CONVERSION_H_