[Autofill] Always show available data when encountering autocomplete attributes

chrome/renderer/autofill/form_autofill_browsertest.cc

 // Copyright (c) 2012 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 <vector>
 
 #include "base/format_macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 4110 matching lines @@
       frame->document().all(), &fieldsets);
   ASSERT_TRUE(control_elements.empty());
   ASSERT_TRUE(fieldsets.empty());
 
   FormData form;
   EXPECT_FALSE(UnownedCheckoutFormElementsAndFieldSetsToFormData(
       fieldsets, control_elements, nullptr, frame->document(), extract_mask,
       &form, nullptr));
 }
 
+TEST_F(FormAutofillTest, FormCache_ExtractNewForms) {
+  struct {
+    const char* html;
+    const size_t expected_forms;
+  } test_cases[] = {
+      // An empty form should not be extracted
+      {"<FORM name='TestForm' action='http://buh.com' method='post'>"
+       "</FORM>",
+       0},
+      // A form with less than three fields with no autocomplete type(s) should
+      // not be extracted.
+      {"<FORM name='TestForm' action='http://buh.com' method='post'>"
+       "  <INPUT type='name' id='firstname'/>"
+       "</FORM>",
+       0},
+      // A form with less than three fields with at least one autocomplete type
+      // should be extracted.
+      {"<FORM name='TestForm' action='http://buh.com' method='post'>"
+       "  <INPUT type='name' id='firstname' autocomplete='given-name'/>"
+       "</FORM>",
+       1},
+      // A form with three or more fields should be extracted.
+      {"<FORM name='TestForm' action='http://buh.com' method='post'>"
+       "  <INPUT type='text' id='firstname'/>"
+       "  <INPUT type='text' id='lastname'/>"
+       "  <INPUT type='text' id='email'/>"
+       "  <INPUT type='submit' value='Send'/>"
+       "</FORM>",
+       1},
+  };
+
+  for (auto test_case : test_cases) {
+    LoadHTML(test_case.html);
+
+    WebFrame* web_frame = GetMainFrame();
+    ASSERT_NE(nullptr, web_frame);
+
+    FormCache form_cache(*web_frame);
+    std::vector<FormData> forms = form_cache.ExtractNewForms();
+    EXPECT_EQ(test_case.expected_forms, forms.size());
+  }
+}
+
 }  // namespace form_util
 }  // namespace autofill