Generate passwords only for forms that autofill server marks as account creation forms.

components/autofill/core/browser/form_structure_unittest.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/form_structure.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/content/browser/autocheckout_page_meta_data.h"
@@ skipping 2408 matching lines @@
   form.action = form.origin.Resolve("/login");
 
   FormFieldData field;
   field.label = ASCIIToUTF16("username");
   field.name = ASCIIToUTF16("username");
   field.form_control_type = "text";
   form.fields.push_back(field);
 
   field.label = ASCIIToUTF16("password");
   field.name = ASCIIToUTF16("password");
   field.form_control_type = "password";

[Ilya Sherman, 2013/09/03 23:58:01]

nit: Please update the field type to be a checkable type (and update the label
and name as well to match).

[zysxqn, 2013/09/04 17:26:20]

Done.

+  field.is_checkable = true;
   form.fields.push_back(field);
 
   field.label = base::string16();
   field.name = ASCIIToUTF16("email");
   field.form_control_type = "text";
   form.fields.push_back(field);
 
   ScopedVector<FormStructure> forms;
   forms.push_back(new FormStructure(form, std::string()));
   std::vector<std::string> encoded_signatures;
@@ skipping 17 matching lines @@
       "<autofillqueryresponse><field autofilltype=\"3\" />"
       "<field autofilltype=\"9\" /></autofillqueryresponse>";
   FormStructure::ParseQueryResponse(kServerResponse, forms.get(),
                                     &page_meta_data, TestAutofillMetrics());
   ASSERT_EQ(NAME_FIRST, forms[0]->field(0)->server_type());
   ASSERT_EQ(NO_SERVER_DATA, forms[0]->field(1)->server_type());
   ASSERT_EQ(EMAIL_ADDRESS, forms[0]->field(2)->server_type());
 }
 
 }  // namespace autofill