Http Bad: Add "Learn more" sublabel to warning message and make it clickable

components/autofill/core/browser/autofill_external_delegate.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/autofill_external_delegate.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 207 matching lines @@
     driver_->RendererShouldAcceptDataListSuggestion(value);
   } else if (identifier == POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY) {
     // User selected an Autocomplete, so we fill directly.
     driver_->RendererShouldFillFieldWithValue(value);
     AutofillMetrics::LogAutocompleteSuggestionAcceptedIndex(position);
   } else if (identifier == POPUP_ITEM_ID_SCAN_CREDIT_CARD) {
     manager_->client()->ScanCreditCard(base::Bind(
         &AutofillExternalDelegate::OnCreditCardScanned, GetWeakPtr()));
   } else if (identifier == POPUP_ITEM_ID_CREDIT_CARD_SIGNIN_PROMO) {
     manager_->client()->StartSigninFlow();
+  } else if (identifier == POPUP_ITEM_ID_HTTP_NOT_SECURE_WARNING_MESSAGE) {
+    manager_->client()->ShowHttpNotSecureExplanation();
   } else {
     if (identifier > 0)  // Denotes an Autofill suggestion.
       AutofillMetrics::LogAutofillSuggestionAcceptedIndex(position);
 
     FillAutofillFormData(identifier, false);
   }
 
   if (should_show_scan_credit_card_) {
     AutofillMetrics::LogScanCreditCardPromptMetric(
         identifier == POPUP_ITEM_ID_SCAN_CREDIT_CARD
@@ skipping 136 matching lines @@
   suggestions->insert(suggestions->begin(), data_list_values_.size(),
                       Suggestion());
   for (size_t i = 0; i < data_list_values_.size(); i++) {
     (*suggestions)[i].value = data_list_values_[i];
     (*suggestions)[i].label = data_list_labels_[i];
     (*suggestions)[i].frontend_id = POPUP_ITEM_ID_DATALIST_ENTRY;
   }
 }
 
 }  // namespace autofill