Added the aria-sort state to the accessibility tree.

content/renderer/accessibility/blink_ax_enum_conversion.h

Index: content/renderer/accessibility/blink_ax_enum_conversion.h
diff --git a/content/renderer/accessibility/blink_ax_enum_conversion.h b/content/renderer/accessibility/blink_ax_enum_conversion.h
index 6d56ce4f1ae9befd4f3cadfdef60a04679e84249..2b74061852ecebb73f06a1bdc7f67b24e12c4159 100644
--- a/content/renderer/accessibility/blink_ax_enum_conversion.h
+++ b/content/renderer/accessibility/blink_ax_enum_conversion.h
@@ -32,6 +32,11 @@ ui::AXTextDirection AXTextDirectionFromBlink(
 ui::AXInvalidState AXInvalidStateFromBlink(
     blink::WebAXInvalidState invalid_state);
 
+// Convert a Blink WebAXSortDirection to an AXSortDirection defined in
+// ui/accessibility.
+ui::AXSortDirection AXSortDirectionFromBlink(
+    blink::WebAXSortDirection sort_direction);
+
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ACCESSIBILITY_BLINK_AX_ENUM_CONVERSION_H_