Implemented the "aria-current" state on Windows.

ui/accessibility/ax_node_data.cc

Index: ui/accessibility/ax_node_data.cc
diff --git a/ui/accessibility/ax_node_data.cc b/ui/accessibility/ax_node_data.cc
index bc7fff2bcc1381c762c5e67bef8dfa50a0b602c6..9a3c3f937a6d4eb7b2cf5dc46003523934d3a0d6 100644
--- a/ui/accessibility/ax_node_data.cc
+++ b/ui/accessibility/ax_node_data.cc
@@ -449,6 +449,31 @@ std::string AXNodeData::ToString() const {
         result += base::StringPrintf(" color_value=&%X",
                                      int_attributes[i].second);
         break;
+      case AX_ATTR_ARIA_CURRENT_STATE:
+        switch (int_attributes[i].second) {
+          case AX_ARIA_CURRENT_STATE_FALSE:
+            result += " aria_current_state=false";
+            break;
+          case AX_ARIA_CURRENT_STATE_TRUE:
+            result += " aria_current_state=true";
+            break;
+          case AX_ARIA_CURRENT_STATE_PAGE:
+            result += " aria_current_state=page";
+            break;
+          case AX_ARIA_CURRENT_STATE_STEP:
+            result += " aria_current_state=step";
+            break;
+          case AX_ARIA_CURRENT_STATE_LOCATION:
+            result += " aria_current_state=location";
+            break;
+          case AX_ARIA_CURRENT_STATE_DATE:
+            result += " aria_current_state=date";
+            break;
+          case AX_ARIA_CURRENT_STATE_TIME:
+            result += " aria_current_state=time";
+            break;
+        }
+        break;
       case AX_ATTR_BACKGROUND_COLOR:
         result += base::StringPrintf(" background_color=&%X",
                                      int_attributes[i].second);