Mark the single autofilled field when the relevant section is autofilled.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index 370a8f02e4aeced484a49090925c117b1ca8e2c3..a69286272af7758ac2846601cadb43ed13f18077 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -569,6 +569,12 @@ void AutofillManager::FillOrPreviewForm(
           // user edits an autofilled field (for metrics).
           autofill_field->is_autofilled = true;
 
+          // Mark the field as autofilled when a non-empty value is assigned to
+          // it. This allows the renderer to distinguish autofilled fields from
+          // fields with non-empty values, such as select-one fields.
+          int index = iter - result.fields.begin();
+          result.fields[index].is_autofilled = true;

[Ilya Sherman, 2014/06/27 05:59:08]

Why do you need an index?  Can you just write this as "iter->is_autofilled =
true;"?

+
           if (!is_credit_card && !value.empty())
             client_->DidFillOrPreviewField(value, profile_full_name);
         }