Console logging for rAc developer errors.

components/autofill/content/renderer/autofill_agent.h

Index: components/autofill/content/renderer/autofill_agent.h
diff --git a/components/autofill/content/renderer/autofill_agent.h b/components/autofill/content/renderer/autofill_agent.h
index 218c4334094675a8aeccb4bed7f0dc984a01513f..174d8f1fed55370e1e7091a9a85e7b670d41c79c 100644
--- a/components/autofill/content/renderer/autofill_agent.h
+++ b/components/autofill/content/renderer/autofill_agent.h
@@ -108,9 +108,11 @@ class AutofillAgent : public content::RenderViewObserver,
   void OnAcceptDataListSuggestion(const base::string16& value);
   void OnAcceptPasswordAutofillSuggestion(const base::string16& username);
 
-  // Called when interactive autocomplete finishes.
+  // Called when interactive autocomplete finishes. |message| is printed to
+  // the console if non-empty.
   void OnRequestAutocompleteResult(
       blink::WebFormElement::AutocompleteResult result,
+      const base::string16& message,
       const FormData& form_data);
 
   // Called when an autocomplete request succeeds or fails with the |result|.