[Web Payments] Add Cancel button to all sheets

chrome/browser/ui/views/payments/payment_request_views_util.h

Index: chrome/browser/ui/views/payments/payment_request_views_util.h
diff --git a/chrome/browser/ui/views/payments/payment_request_views_util.h b/chrome/browser/ui/views/payments/payment_request_views_util.h
index 13e250614e9a4e19fa1678f90432b847426be79c..f699c5b8ab29b275c6f17d52b2c630879d00a0ba 100644
--- a/chrome/browser/ui/views/payments/payment_request_views_util.h
+++ b/chrome/browser/ui/views/payments/payment_request_views_util.h
@@ -22,6 +22,8 @@ class View;
 
 namespace payments {
 
+class PaymentRequestSheetController;
+
 constexpr int kPaymentRequestRowHorizontalInsets = 14;
 constexpr int kPaymentRequestRowVerticalInsets = 8;
 
@@ -57,11 +59,12 @@ std::unique_ptr<views::View> CreateSheetHeaderView(
 // |          CONTENT          |
 // |           VIEW            |
 // +---------------------------+
-// |            | CANCEL | PAY |
+// |            | CANCEL | PAY | <-- |buttons_view|
 // +---------------------------+
 std::unique_ptr<views::View> CreatePaymentView(
     std::unique_ptr<views::View> header_view,
-    std::unique_ptr<views::View> content_view);
+    std::unique_ptr<views::View> content_view,
+    std::unique_ptr<views::View> buttons_view);
 
 // Represents formatting options for each of the different contexts in which an
 // Address label may be displayed.
@@ -89,6 +92,11 @@ std::unique_ptr<views::View> GetContactInfoLabel(
 // as a separator between items in the Payment Request dialog.
 std::unique_ptr<views::Border> CreatePaymentRequestRowBorder();
 
+// Creates the row of button containing the Pay, cancel, and extra buttons.
+// |controller| is installed as the listener for button events.
+std::unique_ptr<views::View> CreateButtonsView(
+    PaymentRequestSheetController* controller);
+
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_VIEWS_UTIL_H_