[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..ac8e917015305687d5b0587f933c04c444b6d2e2 100644
--- a/chrome/browser/ui/views/payments/payment_request_sheet_controller.h
+++ b/chrome/browser/ui/views/payments/payment_request_sheet_controller.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h"
 #include "ui/views/controls/button/button.h"
 
 namespace views {
@@ -100,6 +101,10 @@ class PaymentRequestSheetController : public views::ButtonListener {
   // CreatePaymentView and related functions.
   virtual views::View* GetFirstFocusedView();
 
+  // Returns true if the subclass wants the content sheet to have an id, and
+  // sets |sheet_id| to the desired value.
+  virtual bool GetSheetId(DialogViewID* sheet_id);
+
  private:
   // Creates a view to be displayed in the PaymentRequestDialog.
   // |header_view| is the view displayed on top of the dialog, containing title,
@@ -118,6 +123,11 @@ 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_;