[Web Payments] Add a mechanism to build item lists in the PR dialog.

chrome/browser/ui/views/payments/payment_request_sheet_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/payment_request_sheet_controller.h"
 
 #include "chrome/browser/ui/views/payments/payment_request_dialog_view.h"
 #include "chrome/browser/ui/views/payments/payment_request_views_util.h"
 #include "components/strings/grit/components_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/md_text_button.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/layout/grid_layout.h"
 
 namespace payments {
 
 PaymentRequestSheetController::PaymentRequestSheetController(
     PaymentRequest* request, PaymentRequestDialogView* dialog)
   : request_(request), dialog_(dialog) {
 }
 
 std::unique_ptr<views::Button>
 PaymentRequestSheetController::CreatePrimaryButton() {
   return nullptr;
 }
 
+std::unique_ptr<views::View> PaymentRequestSheetController::CreateExtraView() {
+  return nullptr;
+}
+
 void PaymentRequestSheetController::ButtonPressed(
     views::Button* sender, const ui::Event& event) {
   switch (static_cast<PaymentRequestCommonTags>(sender->tag())) {
     case PaymentRequestCommonTags::CLOSE_BUTTON_TAG:
       dialog()->CloseDialog();
       break;
     case PaymentRequestCommonTags::BACK_BUTTON_TAG:
       dialog()->GoBack();
       break;
     case PaymentRequestCommonTags::PAYMENT_REQUEST_COMMON_TAG_MAX:
@@ skipping 41 matching lines @@
   views::GridLayout* layout = new views::GridLayout(container.get());
   container->SetLayoutManager(layout);
 
   views::ColumnSet* columns = layout->AddColumnSet(0);
   columns->AddColumn(views::GridLayout::LEADING, views::GridLayout::CENTER,
                      0, views::GridLayout::USE_PREF, 0, 0);
   columns->AddPaddingColumn(1, 0);
   columns->AddColumn(views::GridLayout::TRAILING, views::GridLayout::CENTER,
                      0, views::GridLayout::USE_PREF, 0, 0);
 
-  // The horizontal distance between the right/left edges of the dialog and the
-  // elements.
-  constexpr int kFooterHorizontalInset = 16;
-  // The vertical distance between footer elements and the top/bottom border
-  // (the bottom border is the edge of the dialog).
-  constexpr int kFooterVerticalInset = 16;
-  layout->SetInsets(kFooterVerticalInset, kFooterHorizontalInset,
-                    kFooterVerticalInset, kFooterHorizontalInset);
-
   layout->StartRow(0, 0);
-
-  layout->AddView(CreateLeadingFooterView().release());
+  std::unique_ptr<views::View> extra_view = CreateExtraView();
+  if (extra_view)
+    layout->AddView(extra_view.release());
+  else
+    layout->SkipColumns(1);
 
   std::unique_ptr<views::View> trailing_buttons_container =
       base::MakeUnique<views::View>();
 
-  constexpr int kButtonSpacing = 10;
   trailing_buttons_container->SetLayoutManager(new views::BoxLayout(
-      views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing));
+      views::BoxLayout::kHorizontal, kPaymentRequestRowHorizontalInsets,
+      kPaymentRequestRowVerticalInsets, kPaymentRequestButtonSpacing));
 
   std::unique_ptr<views::Button> primary_button = CreatePrimaryButton();
   if (primary_button)
     trailing_buttons_container->AddChildView(primary_button.release());
 
   views::LabelButton* button = views::MdTextButton::CreateSecondaryUiButton(
       this, l10n_util::GetStringUTF16(IDS_CANCEL));
   button->set_tag(static_cast<int>(PaymentRequestCommonTags::CLOSE_BUTTON_TAG));
   trailing_buttons_container->AddChildView(button);
 
   layout->AddView(trailing_buttons_container.release());
 
   return container;
 }
 
 std::unique_ptr<views::View>
 PaymentRequestSheetController::CreateLeadingFooterView() {
   return base::MakeUnique<views::View>();
 }
 
 }  // namespace payments