Implemented the "aria-current" state on Windows.

content/renderer/accessibility/blink_ax_tree_source.cc

 // 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.
 
 #include "content/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 300 matching lines @@
   if (src.fontFamily().length()) {
     WebAXObject parent = src.parentObject();
     if (parent.isNull() || parent.fontFamily() != src.fontFamily())
       dst->AddStringAttribute(ui::AX_ATTR_FONT_FAMILY, src.fontFamily().utf8());
   }
 
   // Font size is in pixels.
   if (src.fontSize())
     dst->AddFloatAttribute(ui::AX_ATTR_FONT_SIZE, src.fontSize());
 
+  if (src.ariaCurrentState()) {
+    dst->AddIntAttribute(ui::AX_ATTR_ARIA_CURRENT_STATE,
+                         AXAriaCurrentStateFromBlink(src.ariaCurrentState()));
+  }
+
   if (src.invalidState()) {
     dst->AddIntAttribute(ui::AX_ATTR_INVALID_STATE,
                          AXInvalidStateFromBlink(src.invalidState()));
   }
   if (src.invalidState() == blink::WebAXInvalidStateOther &&
       src.ariaInvalidValue().length()) {
     dst->AddStringAttribute(
         ui::AX_ATTR_ARIA_INVALID_VALUE, src.ariaInvalidValue().utf8());
   }
 
@@ skipping 318 matching lines @@
   }
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content