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

components/autofill/renderer/autofill_agent.cc

Index: components/autofill/renderer/autofill_agent.cc
diff --git a/components/autofill/renderer/autofill_agent.cc b/components/autofill/renderer/autofill_agent.cc
index 2c717832c1929d9ff7387596d5d395a9e27154b8..f169bfba4786fa446ad32708a5d71db37dff6c11 100644
--- a/components/autofill/renderer/autofill_agent.cc
+++ b/components/autofill/renderer/autofill_agent.cc
@@ -216,7 +216,8 @@ void AutofillAgent::DidFinishDocumentLoad(WebFrame* frame) {
   if (!forms.empty() || !frame->parent()) {
     Send(new AutofillHostMsg_FormsSeen(routing_id(), forms,
                                        forms_seen_timestamp_,
-                                       has_more_forms));
+                                       has_more_forms,
+                                       false /* is_post_document_load */));
   }
 }
 
@@ -731,7 +732,7 @@ void AutofillAgent::OnGetAllForms() {
 
   // Report to AutofillManager that all forms are being sent.
   Send(new AutofillHostMsg_FormsSeen(routing_id(), forms,
-                                     forms_seen_timestamp_, false));
+                                     forms_seen_timestamp_, false, false));
 }
 
 void AutofillAgent::OnRequestAutocompleteResult(
@@ -775,6 +776,20 @@ void AutofillAgent::OnFillFormsAndClick(
 
 void AutofillAgent::OnWhitelistedForAutocheckout() {
   is_whitelisted_for_autocheckout_ = true;
+  if (forms_have_changed_since_load_) {
+    forms_have_changed_since_load_ = false;
+    bool has_more_forms = false;
+    std::vector<FormData> forms;
+    form_elements_.clear();
+    has_more_forms = form_cache_.ExtractFormsAndFormElements(
+        *topmost_frame_, kRequiredAutofillFields, &forms, &form_elements_);
+    if (!forms.empty()) {
+      Send(new AutofillHostMsg_FormsSeen(routing_id(), forms,
+                                         base::TimeTicks::Now(),
+                                         has_more_forms,
+                                         true /* is_post_document_load */));
+    }
+  }
 }
 
 void AutofillAgent::ClickFailed() {
@@ -932,4 +947,28 @@ void AutofillAgent::HideHostAutofillUi() {
   Send(new AutofillHostMsg_HideAutofillUi(routing_id()));
 }
 
+void AutofillAgent::didAssociateFormControls(const WebKit::WebVector<WebKit::WebNode>& nodes) {
+  for (size_t i = 0; i < nodes.size(); ++i) {
+    WebKit::WebNode node = nodes[i];
+    if (node.document().frame() == topmost_frame_) {
+      forms_have_changed_since_load_ = true;
+      if (is_whitelisted_for_autocheckout_) {
+        forms_have_changed_since_load_ = false;
+        bool has_more_forms = false;
+        std::vector<FormData> forms;
+        form_elements_.clear();
+        has_more_forms = form_cache_.ExtractFormsAndFormElements(
+            *topmost_frame_, kRequiredAutofillFields, &forms, &form_elements_);
+        if (!forms.empty()) {
+          Send(new AutofillHostMsg_FormsSeen(routing_id(), forms,
+	                                     base::TimeTicks::Now(),
+                                             has_more_forms,
+                                             true /* is_post_document_load */));
+        }
+      }
+      return;
+    }
+  }
+}
+
 }  // namespace autofill