Implemented the "aria-current" state on Windows.

content/renderer/accessibility/blink_ax_enum_conversion.cc

Index: content/renderer/accessibility/blink_ax_enum_conversion.cc
diff --git a/content/renderer/accessibility/blink_ax_enum_conversion.cc b/content/renderer/accessibility/blink_ax_enum_conversion.cc
index eea58484e845ee9839d1eb73fb2b22c4380b5fd0..28beae9ec83cfc28260e33163a6eb46ffa011a1c 100644
--- a/content/renderer/accessibility/blink_ax_enum_conversion.cc
+++ b/content/renderer/accessibility/blink_ax_enum_conversion.cc
@@ -434,6 +434,30 @@ ui::AXTextStyle AXTextStyleFromBlink(blink::WebAXTextStyle text_style) {
   return static_cast<ui::AXTextStyle>(browser_text_style);
 }
 
+ui::AXAriaCurrent AXAriaCurrentFromBlink(blink::WebAXAriaCurrent aria_current) {
+  switch (aria_current) {
+    case blink::WebAXAriaCurrentUndefined:
+      return ui::AX_ARIA_CURRENT_NONE;
+    case blink::WebAXAriaCurrentFalse:
+      return ui::AX_ARIA_CURRENT_FALSE;
+    case blink::WebAXAriaCurrentTrue:
+      return ui::AX_ARIA_CURRENT_TRUE;
+    case blink::WebAXAriaCurrentPage:
+      return ui::AX_ARIA_CURRENT_PAGE;
+    case blink::WebAXAriaCurrentStep:
+      return ui::AX_ARIA_CURRENT_STEP;
+    case blink::WebAXAriaCurrentLocation:
+      return ui::AX_ARIA_CURRENT_LOCATION;
+    case blink::WebAXAriaCurrentDate:
+      return ui::AX_ARIA_CURRENT_DATE;
+    case blink::WebAXAriaCurrentTime:
+      return ui::AX_ARIA_CURRENT_TIME;
+  }
+
+  NOTREACHED();
+  return ui::AX_ARIA_CURRENT_NONE;
+}
+
 ui::AXInvalidState AXInvalidStateFromBlink(
     blink::WebAXInvalidState invalid_state) {
   switch (invalid_state) {
@@ -449,10 +473,9 @@ ui::AXInvalidState AXInvalidStateFromBlink(
       return ui::AX_INVALID_STATE_GRAMMAR;
     case blink::WebAXInvalidStateOther:
       return ui::AX_INVALID_STATE_OTHER;
-    default:
-      NOTREACHED();
   }
 
+  NOTREACHED();
   return ui::AX_INVALID_STATE_NONE;
 }