[WebPayments] Factor out sheet-specific logic in Controllers.

chrome/browser/ui/BUILD.gn

Index: chrome/browser/ui/BUILD.gn
diff --git a/chrome/browser/ui/BUILD.gn b/chrome/browser/ui/BUILD.gn
index 44a84a8c259034e61cc5beec435d59ccf971af10..bd252f0a1be4f1e9d6cbfd89e4c4da6c2d3ecd1e 100644
--- a/chrome/browser/ui/BUILD.gn
+++ b/chrome/browser/ui/BUILD.gn
@@ -1793,8 +1793,15 @@ split_static_library("ui") {
         "views/passwords/manage_passwords_bubble_view.h",
         "views/passwords/manage_passwords_icon_views.cc",
         "views/passwords/manage_passwords_icon_views.h",
+        "views/payments/order_summary_view_controller.cc",
+        "views/payments/order_summary_view_controller.h",
         "views/payments/payment_request_dialog.cc",
         "views/payments/payment_request_dialog.h",
+        "views/payments/payment_request_sheet_controller.h",
+        "views/payments/payment_request_views_util.cc",
+        "views/payments/payment_request_views_util.h",
+        "views/payments/payment_sheet_view_controller.cc",
+        "views/payments/payment_sheet_view_controller.h",
         "views/payments/view_stack.cc",
         "views/payments/view_stack.h",
         "views/process_singleton_dialog_linux.cc",