Requery the autofill server when forms and input fields are dynamically added.

components/autofill/common/forms_seen_param.h

+// 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.
+
+#ifndef COMPONENTS_AUTOFILL_COMMON_FORMS_SEEN_PARAM_H_
+#define COMPONENTS_AUTOFILL_COMMON_FORMS_SEEN_PARAM_H_
+
+namespace autofill {
+
+// Specifies the nature of the forms triggering the call.
+enum FormsSeenParam {
+  // Forms present on page load with no additional unsent forms.
+  NO_SPECIAL_FORMS_SEEN = 0,
+  // If this an Autocheckout page, there are more that should be checked.
+  PARTIAL_FORMS_SEEN = 1 << 0,
+  // Forms were added dynamically post-page load.
+  DYNAMIC_FORMS_SEEN = 1 << 1,
+  // PARTIAL_FORMS_SEEN + DYNAMIC_FORMS_SEEN
+  PARTIAL_AND_DYNAMIC_FORMS_SEEN = (1 << 0) | (1 << 1),
+};
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_COMMON_FORMS_SEEN_PARAM_H_