[Web Payments] Implement proper focusing in Payment Request

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

 // Copyright 2016 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/payment_request_dialog_view.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 68 matching lines @@
 
   chrome::RecordDialogCreation(chrome::DialogIdentifier::PAYMENT_REQUEST);
 }
 
 PaymentRequestDialogView::~PaymentRequestDialogView() {}
 
 ui::ModalType PaymentRequestDialogView::GetModalType() const {
   return ui::MODAL_TYPE_CHILD;
 }
 
+views::View* PaymentRequestDialogView::GetInitiallyFocusedView() {
+  return view_stack_.get();
+}
+
 bool PaymentRequestDialogView::Cancel() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   // Called when the widget is about to close. We send a message to the
   // PaymentRequest object to signal user cancellation.
   //
   // The order of destruction is important here. First destroy all the views
   // because they may have pointers/delegates to their controllers. Then destroy
   // all the controllers, because they may have pointers to PaymentRequestSpec/
   // PaymentRequestState. Then send the signal to PaymentRequest to destroy.
   being_closed_ = true;
@@ skipping 244 matching lines @@
   // When a view that is associated with a controller is removed from this
   // view's descendants, dispose of the controller.
   if (!details.is_add &&
       controller_map_.find(details.child) != controller_map_.end()) {
     DCHECK(!details.move_view);
     controller_map_.erase(details.child);
   }
 }
 
 }  // namespace payments