[Web Payments] Refactor sheet display to allow updating view content

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

Index: chrome/browser/ui/views/payments/payment_sheet_view_controller.cc
diff --git a/chrome/browser/ui/views/payments/payment_sheet_view_controller.cc b/chrome/browser/ui/views/payments/payment_sheet_view_controller.cc
index 5b1eba8f80a517d577ffe3c92fe8f5fd24a98271..b6d15fd4d6bd360765f6d9672e25c347b2484271 100644
--- a/chrome/browser/ui/views/payments/payment_sheet_view_controller.cc
+++ b/chrome/browser/ui/views/payments/payment_sheet_view_controller.cc
@@ -194,10 +194,8 @@ PaymentSheetViewController::PaymentSheetViewController(
     PaymentRequestState* state,
     PaymentRequestDialogView* dialog)
     : PaymentRequestSheetController(spec, state, dialog),
-      container_view_(base::MakeUnique<views::View>()),
       pay_button_(nullptr),
       widest_name_column_view_width_(ComputeWidestNameColumnViewWidth()) {
-  container_view_->set_owned_by_client();
   state->AddObserver(this);
 }
 
@@ -205,25 +203,9 @@ PaymentSheetViewController::~PaymentSheetViewController() {
   state()->RemoveObserver(this);
 }
 
-std::unique_ptr<views::View> PaymentSheetViewController::CreateView() {
-  std::unique_ptr<views::View> content_view = base::MakeUnique<views::View>();
-  content_view->SetLayoutManager(new views::FillLayout);
-
-  UpdateContentView();
-  content_view->AddChildView(container_view_.get());
-
-  return CreatePaymentView(
-      CreateSheetHeaderView(
-          false,
-          l10n_util::GetStringUTF16(IDS_PAYMENT_REQUEST_PAYMENT_SHEET_TITLE),
-          this),
-      std::move(content_view));
-}
-
 void PaymentSheetViewController::OnSelectedInformationChanged() {
   UpdatePayButtonState(state()->is_ready_to_pay());
   UpdateContentView();
-  container_view_->Layout();
 }
 
 std::unique_ptr<views::Button>
@@ -238,6 +220,40 @@ PaymentSheetViewController::CreatePrimaryButton() {
   return button;
 }
 
+bool PaymentSheetViewController::ShouldShowHeaderBackArrow() {
+  return false;
+}
+
+base::string16 PaymentSheetViewController::GetSheetTitle() {
+  return l10n_util::GetStringUTF16(IDS_PAYMENT_REQUEST_PAYMENT_SHEET_TITLE);
+}
+
+void PaymentSheetViewController::FillContentView(views::View* content_view) {
+  views::GridLayout* layout = new views::GridLayout(content_view);
+  content_view->SetLayoutManager(layout);
+  views::ColumnSet* columns = layout->AddColumnSet(0);
+  columns->AddColumn(views::GridLayout::FILL, views::GridLayout::CENTER, 1,
+                     views::GridLayout::USE_PREF, 0, 0);
+
+  // The shipping address and contact info rows are optional.
+  layout->StartRow(0, 0);
+  layout->AddView(CreatePaymentSheetSummaryRow().release());
+
+  if (spec()->request_shipping()) {
+    layout->StartRow(0, 0);
+    layout->AddView(CreateShippingRow().release());
+    layout->StartRow(0, 0);
+    layout->AddView(CreateShippingOptionRow().release());
+  }
+  layout->StartRow(0, 0);
+  layout->AddView(CreatePaymentMethodRow().release());
+  if (spec()->request_payer_name() || spec()->request_payer_email() ||
+      spec()->request_payer_phone()) {
+    layout->StartRow(0, 0);
+    layout->AddView(CreateContactInfoRow().release());
+  }
+}
+
 // Adds the product logo to the footer.
 // +---------------------------------------------------------+
 // | (•) chrome                               | PAY | CANCEL |
@@ -303,33 +319,6 @@ void PaymentSheetViewController::UpdatePayButtonState(bool enabled) {
   pay_button_->SetEnabled(enabled);
 }
 
-void PaymentSheetViewController::UpdateContentView() {
-  container_view_->RemoveAllChildViews(/*delete_children=*/true);
-  views::GridLayout* layout = new views::GridLayout(container_view_.get());
-  container_view_->SetLayoutManager(layout);
-  views::ColumnSet* columns = layout->AddColumnSet(0);
-  columns->AddColumn(views::GridLayout::FILL, views::GridLayout::CENTER, 1,
-                     views::GridLayout::USE_PREF, 0, 0);
-
-  // The shipping address and contact info rows are optional.
-  layout->StartRow(0, 0);
-  layout->AddView(CreatePaymentSheetSummaryRow().release());
-
-  if (spec()->request_shipping()) {
-    layout->StartRow(0, 0);
-    layout->AddView(CreateShippingRow().release());
-    layout->StartRow(0, 0);
-    layout->AddView(CreateShippingOptionRow().release());
-  }
-  layout->StartRow(0, 0);
-  layout->AddView(CreatePaymentMethodRow().release());
-  if (spec()->request_payer_name() || spec()->request_payer_email() ||
-      spec()->request_payer_phone()) {
-    layout->StartRow(0, 0);
-    layout->AddView(CreateContactInfoRow().release());
-  }
-}
-
 // Creates the Order Summary row, which contains an "Order Summary" label,
 // an inline list of display items, a Total Amount label, and a Chevron.
 // +----------------------------------------------+