[Autofill] Fill fields that have an autocomplete attributes even if not in a form.

components/autofill/content/renderer/form_autofill_util.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/content/renderer/form_autofill_util.h"
 
 #include <map>
 #include <set>
 
 #include "base/command_line.h"
@@ skipping 1502 matching lines @@
     "wallet"
   };
 
   for (const auto& keyword : kKeywords) {
     // Compare char16 elements of |title| with char elements of |keyword| using
     // operator==.
     auto title_pos = std::search(title.begin(), title.end(),
                                  keyword, keyword + strlen(keyword));
     if (title_pos != title.end() ||
         path.find(keyword) != std::string::npos) {
+      form->is_formless_checkout = true;
       // Found a keyword: treat this as an unowned form.
       return UnownedFormElementsAndFieldSetsToFormData(
           fieldsets, control_elements, element, document, extract_mask, form,
           field);
     }
   }
 
-  return false;
+  // Since it's not a checkout flow, only add fields that have a non-"off"
+  // autocomplete attribute to the formless autofill.
+  CR_DEFINE_STATIC_LOCAL(WebString, kOffAttribute, ("off"));
+  std::vector<WebFormControlElement> elements_with_autocomplete;
+  for (const WebFormControlElement& element : control_elements) {
+    blink::WebString autocomplete = element.getAttribute("autocomplete");
+    if (autocomplete.length() && autocomplete != kOffAttribute)
+      elements_with_autocomplete.push_back(element);
+  }
+
+  if (elements_with_autocomplete.empty())
+    return false;
+
+  return UnownedFormElementsAndFieldSetsToFormData(
+      fieldsets, elements_with_autocomplete, element, document, extract_mask,
+      form, field);
 }
 
 bool UnownedPasswordFormElementsAndFieldSetsToFormData(
     const std::vector<blink::WebElement>& fieldsets,
     const std::vector<blink::WebFormControlElement>& control_elements,
     const blink::WebFormControlElement* element,
     const blink::WebDocument& document,
     ExtractMask extract_mask,
     FormData* form,
     FormFieldData* field) {
@@ skipping 194 matching lines @@
     // Zero selection start is for password manager, which can show usernames
     // that do not begin with the user input value.
     selection_start = (offset == base::string16::npos) ? 0 : offset;
   }
 
   input_element->setSelectionRange(selection_start, suggestion.length());
 }
 
 }  // namespace form_util
 }  // namespace autofill