Added the aria-sort state to the accessibility tree.

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 e6f252f2a864373b4396adb724ce03729ae313e8..9fe5b24999cf77097fb5bc97cb64ed60fc29409e 100644
--- a/content/renderer/accessibility/blink_ax_enum_conversion.cc
+++ b/content/renderer/accessibility/blink_ax_enum_conversion.cc
@@ -422,4 +422,24 @@ ui::AXInvalidState AXInvalidStateFromBlink(
   return ui::AX_INVALID_STATE_NONE;
 }
 
-}  // namespace content
+ui::AXSortDirection AXSortDirectionFromBlink(
+    blink::WebAXSortDirection sort_direction) {
+  switch (sort_direction) {
+    case blink::WebAXSortDirectionUndefined:
+      return ui::AX_SORT_DIRECTION_NONE;
+    case blink::WebAXSortDirectionNone:
+      return ui::AX_SORT_DIRECTION_UNSORTED;
+    case blink::WebAXSortDirectionAscending:
+      return ui::AX_SORT_DIRECTION_ASCENDING;
+    case blink::WebAXSortDirectionDescending:
+      return ui::AX_SORT_DIRECTION_DESCENDING;
+    case blink::WebAXSortDirectionOther:
+      return ui::AX_SORT_DIRECTION_OTHER;
+    default:
+      NOTREACHED();
+  }
+
+  return ui::AX_SORT_DIRECTION_NONE;
+}
+
+}  // Namespace content.