[Web Payments] Handle "Enter" accelerator when there's a primary action

chrome/browser/ui/views/payments/shipping_address_editor_view_controller.cc

 // Copyright 2017 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 "chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 354 matching lines @@
   if (model->IsPendingRegionDataLoad())
     return;
   if (model->failed_to_load_data()) {
     failed_to_load_region_data_ = true;
     // It is safe to update synchronously since the change comes from the model
     // and not from the UI.
     OnDataChanged(/*synchronous=*/true);
   }
 }
 
+bool ShippingAddressEditorViewController::GetSheetId(DialogViewID* sheet_id) {
+  *sheet_id = DialogViewID::SHIPPING_ADDRESS_EDITOR_SHEET;
+  return true;
+}
+
 ShippingAddressEditorViewController::ShippingAddressValidationDelegate::
     ShippingAddressValidationDelegate(
         ShippingAddressEditorViewController* controller,
         const EditorField& field)
     : field_(field), controller_(controller) {}
 
 ShippingAddressEditorViewController::ShippingAddressValidationDelegate::
     ~ShippingAddressValidationDelegate() {}
 
 bool ShippingAddressEditorViewController::ShippingAddressValidationDelegate::
@@ skipping 31 matching lines @@
   bool is_required_valid = !field_.required;
   const base::string16 displayed_message =
       is_required_valid ? base::ASCIIToUTF16("")
                         : l10n_util::GetStringUTF16(
                               IDS_PAYMENTS_FIELD_REQUIRED_VALIDATION_MESSAGE);
   controller_->DisplayErrorMessageForField(field_, displayed_message);
   return is_required_valid;
 }
 
 }  // namespace payments