[Web Payments] Implement proper focusing in Payment Request

chrome/browser/ui/views/payments/payment_request_views_util.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_views_util.h"
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 170 matching lines @@
                      1, views::GridLayout::USE_PREF, 0, 0);
 
   layout->StartRow(0, 0);
   if (!show_back_arrow) {
     layout->SkipColumns(1);
   } else {
     views::ImageButton* back_arrow = views::CreateVectorImageButton(listener);
     views::SetImageFromVectorIcon(back_arrow, ui::kBackArrowIcon);
     constexpr int kBackArrowSize = 16;
     back_arrow->SetSize(gfx::Size(kBackArrowSize, kBackArrowSize));
+    back_arrow->SetFocusBehavior(views::View::FocusBehavior::ALWAYS);
     back_arrow->set_tag(static_cast<int>(
         PaymentRequestCommonTags::BACK_BUTTON_TAG));
     back_arrow->set_id(static_cast<int>(DialogViewID::BACK_BUTTON));
     layout->AddView(back_arrow);
   }
 
   views::Label* title_label = new views::Label(title);
   title_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   title_label->SetFontList(
       title_label->GetDefaultFontList().DeriveWithSizeDelta(2));
@@ skipping 130 matching lines @@
     amount_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
     amount_label->set_id(
         static_cast<int>(DialogViewID::SHIPPING_OPTION_AMOUNT));
     container->AddChildView(amount_label.release());
   }
 
   return container;
 }
 
 }  // namespace payments