Add upstream bits necessary for iOS card unmask prompt.

components/autofill/core/browser/autofill_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/core/browser/autofill_manager.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <map>
@@ skipping 533 matching lines @@
 bool AutofillManager::WillFillCreditCardNumber(const FormData& form,
                                                const FormFieldData& field) {
   FormStructure* form_structure = nullptr;
   AutofillField* autofill_field = nullptr;
   if (!GetCachedFormAndField(form, field, &form_structure, &autofill_field))
     return false;
 
   if (autofill_field->Type().GetStorableType() == CREDIT_CARD_NUMBER)
     return true;
 
+#if defined(OS_IOS)
+  // On iOS, we only fill out one field at a time. So we only need to check the
+  // current field.
+  return false;
+#endif
+
   // If the relevant section is already autofilled, the new fill operation will
   // only fill |autofill_field|.
   if (SectionIsAutofilled(*form_structure, form, autofill_field->section()))
     return false;
 
   DCHECK_EQ(form_structure->field_count(), form.fields.size());
   for (size_t i = 0; i < form_structure->field_count(); ++i) {
     if (form_structure->field(i)->section() == autofill_field->section() &&
         form_structure->field(i)->Type().GetStorableType() ==
             CREDIT_CARD_NUMBER &&
@@ skipping 947 matching lines @@
     return false;
 
   // Disregard forms that we wouldn't ever autofill in the first place.
   if (!form.ShouldBeParsed())
     return false;
 
   return true;
 }
 
 }  // namespace autofill