[Web Payments] Handle "Enter" accelerator when there's a primary action

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

Index: chrome/browser/ui/views/payments/payment_request_sheet_controller.h
diff --git a/chrome/browser/ui/views/payments/payment_request_sheet_controller.h b/chrome/browser/ui/views/payments/payment_request_sheet_controller.h
index 3a3eacba56a3030b75d09005e3a36f5cbd427e66..c546ce7d0e71dbc8066504a0450bfb94458b974c 100644
--- a/chrome/browser/ui/views/payments/payment_request_sheet_controller.h
+++ b/chrome/browser/ui/views/payments/payment_request_sheet_controller.h
@@ -118,6 +118,11 @@ class PaymentRequestSheetController : public views::ButtonListener {
   // +---------------------------+
   std::unique_ptr<views::View> CreatePaymentView();
 
+  // Called when the Enter accelerator is pressed. Perform the action associated
+  // with the primary button and returns true if it's enabled, returns false
+  // otherwise.
+  bool PerformPrimaryButtonAction();
+
   // All these are not owned. Will outlive this.
   PaymentRequestSpec* spec_;
   PaymentRequestState* state_;