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

components/autofill/browser/autofill_manager.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 "components/autofill/browser/autofill_manager.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <map>
@@ skipping 363 matching lines @@
                    forms_loaded_timestamp_,
                    initial_interaction_timestamp_,
                    timestamp));
   }
 
   return true;
 }
 
 void AutofillManager::OnFormsSeen(const std::vector<FormData>& forms,
                                   const TimeTicks& timestamp,
-                                  bool has_more_forms) {
+                                  autofill::FormsSeenState state) {
+  bool is_post_document_load = state == autofill::DYNAMIC_FORMS_SEEN;
+  bool has_more_forms = state == autofill::PARTIAL_FORMS_SEEN;
+  // If new forms were added via AJAX or DHML, treat as new page.
+  if (is_post_document_load)
+    Reset();
+
   RenderViewHost* host = web_contents()->GetRenderViewHost();
   if (!host)
     return;
 
   if (!GetAutocheckoutURLPrefix().empty()) {
     // If whitelisted URL, fetch all the forms.
-    if (has_more_forms) {
+    if (has_more_forms)
       host->Send(new AutofillMsg_GetAllForms(host->GetRoutingID()));
+    if (!is_post_document_load) {
+      host->Send(
+          new AutofillMsg_AutocheckoutSupported(host->GetRoutingID()));
+    }
+    // Now return early, as OnFormsSeen will get called again with all forms.
+    if (has_more_forms)
       return;
-    }
   }
 
   autocheckout_manager_.OnFormsSeen();
   bool enabled = IsAutofillEnabled();
   if (!has_logged_autofill_enabled_) {
     metric_logger_->LogIsAutofillEnabledAtPageLoad(enabled);
     has_logged_autofill_enabled_ = true;
   }
 
   if (!enabled)
@@ skipping 866 matching lines @@
 
 void AutofillManager::UpdateInitialInteractionTimestamp(
     const TimeTicks& interaction_timestamp) {
   if (initial_interaction_timestamp_.is_null() ||
       interaction_timestamp < initial_interaction_timestamp_) {
     initial_interaction_timestamp_ = interaction_timestamp;
   }
 }
 
 }  // namespace autofill