Exposed the invalid state of form controls to the accessibility APIs.

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 b7c41a10e90b04daf97f8d931f31f04c2acd0520..6d56ce4f1ae9befd4f3cadfdef60a04679e84249 100644
--- a/content/renderer/accessibility/blink_ax_enum_conversion.h
+++ b/content/renderer/accessibility/blink_ax_enum_conversion.h
@@ -27,6 +27,11 @@ uint32 AXStateFromBlink(const blink::WebAXObject& o);
 ui::AXTextDirection AXTextDirectionFromBlink(
     blink::WebAXTextDirection text_direction);
 
+// Convert a Blink WebAXInvalidState to an AXInvalidState defined in
+// ui/accessibility.
+ui::AXInvalidState AXInvalidStateFromBlink(
+    blink::WebAXInvalidState invalid_state);
+
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ACCESSIBILITY_BLINK_AX_ENUM_CONVERSION_H_