[Autofill] Determine Popup RTLness from page

components/autofill/common/forms_seen_state.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 FormsSeenState {
   // 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,
   // Forms were added dynamically post-page load.
   DYNAMIC_FORMS_SEEN = 2,
+  // Number of states.
+  FORMS_SEEN_STATE_NUM_STATES = 3,
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_COMMON_FORMS_SEEN_PARAM_H_