Display a warning when autofill is disabled for a website.

chrome/renderer/autofill_helper.h

Index: chrome/renderer/autofill_helper.h
diff --git a/chrome/renderer/autofill_helper.h b/chrome/renderer/autofill_helper.h
index c85972515ca58f080193083ac25e6d8bf6a0bcbe..efa3e16e1d2631df3c3518ecab8ebe783933d399 100644
--- a/chrome/renderer/autofill_helper.h
+++ b/chrome/renderer/autofill_helper.h
@@ -32,8 +32,10 @@ class AutoFillHelper : public PageClickListener {
   explicit AutoFillHelper(RenderView* render_view);
 
   // Queries the browser for Autocomplete and AutoFill suggestions for the given
-  // |node|.
-  void QueryAutoFillSuggestions(const WebKit::WebNode& node);
+  // |node|.  If |autofill_disabled| is true, the query is guaranteed to return
+  // no results, but might return a descriptive warning message.
+  void QueryAutoFillSuggestions(const WebKit::WebNode& node,
+                                bool autofill_disabled);
 
   // Removes the Autocomplete suggestion |value| for the field named |name|.
   void RemoveAutocompleteSuggestion(const WebKit::WebString& name,
@@ -107,9 +109,14 @@ class AutoFillHelper : public PageClickListener {
   // when |element| contains no text.
   // |requires_caret_at_end| specifies whether suggestions should be shown when
   // the caret is not after the last character in |element|.
+  // |display_warning_if_disabled| specifies whether a warning should be
+  // displayed to the user if autofill has suggestions available, but cannot
+  // fill them because it is disabled (e.g. when trying to fill a credit card
+  // form on a non-secure website).
   void ShowSuggestions(const WebKit::WebInputElement& element,
                        bool autofill_on_empty_values,
-                       bool requires_caret_at_end);
+                       bool requires_caret_at_end,
+                       bool display_warning_if_disabled);
 
   // Queries the AutoFillManager for form data for the form containing |node|.
   // |value| is the current text in the field, and |unique_id| is the selected