Implemented the "aria-current" state on Windows.

third_party/WebKit/Source/modules/accessibility/AXNodeObject.h

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 125 matching lines @@
     // Properties of static elements.
     RGBA32 colorValue() const final;
     bool canvasHasFallbackContent() const final;
     int headingLevel() const final;
     unsigned hierarchicalLevel() const final;
     AccessibilityOrientation orientation() const override;
     String text() const override;
 
     // Properties of interactive elements.
     AccessibilityButtonState checkboxOrRadioValue() const final;
+    AriaCurrentState ariaCurrentState() const final;
     InvalidState getInvalidState() const final;
     // Only used when invalidState() returns InvalidStateOther.
     String ariaInvalidValue() const final;
     String valueDescription() const override;
     float valueForRange() const override;
     float maxValueForRange() const override;
     float minValueForRange() const override;
     String stringValue() const override;
 
     // ARIA attributes.
@@ skipping 53 matching lines @@
     bool isNativeCheckboxInMixedState() const;
     String textFromDescendants(AXObjectSet& visited, bool recursive) const override;
     String nativeTextAlternative(AXObjectSet& visited, AXNameFrom&, AXRelatedObjectVector*, NameSources*, bool* foundTextAlternative) const;
     float stepValueForRange() const;
     bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
 };
 
 } // namespace blink
 
 #endif // AXNodeObject_h