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..3eb894be73df639b3f9b8bbea40fbf238ccf06a1 100644
--- a/content/renderer/accessibility/blink_ax_enum_conversion.cc
+++ b/content/renderer/accessibility/blink_ax_enum_conversion.cc
@@ -434,6 +434,31 @@ ui::AXTextStyle AXTextStyleFromBlink(blink::WebAXTextStyle text_style) {
   return static_cast<ui::AXTextStyle>(browser_text_style);
 }
 
+ui::AXAriaCurrentState AXAriaCurrentStateFromBlink(
+    blink::WebAXAriaCurrentState aria_current_state) {
+  switch (aria_current_state) {
+    case blink::WebAXAriaCurrentStateUndefined:
+      return ui::AX_ARIA_CURRENT_STATE_NONE;
+    case blink::WebAXAriaCurrentStateFalse:
+      return ui::AX_ARIA_CURRENT_STATE_FALSE;
+    case blink::WebAXAriaCurrentStateTrue:
+      return ui::AX_ARIA_CURRENT_STATE_TRUE;
+    case blink::WebAXAriaCurrentStatePage:
+      return ui::AX_ARIA_CURRENT_STATE_PAGE;
+    case blink::WebAXAriaCurrentStateStep:
+      return ui::AX_ARIA_CURRENT_STATE_STEP;
+    case blink::WebAXAriaCurrentStateLocation:
+      return ui::AX_ARIA_CURRENT_STATE_LOCATION;
+    case blink::WebAXAriaCurrentStateDate:
+      return ui::AX_ARIA_CURRENT_STATE_DATE;
+    case blink::WebAXAriaCurrentStateTime:
+      return ui::AX_ARIA_CURRENT_STATE_TIME;
+  }
+
+  NOTREACHED();
+  return ui::AX_ARIA_CURRENT_STATE_NONE;
+}
+
 ui::AXInvalidState AXInvalidStateFromBlink(
     blink::WebAXInvalidState invalid_state) {
   switch (invalid_state) {
@@ -449,10 +474,9 @@ 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;
 }