[Web Payments] Implement the CVC Unmask dialog.

components/payments/content/payment_request_state.h

Index: components/payments/content/payment_request_state.h
diff --git a/components/payments/content/payment_request_state.h b/components/payments/content/payment_request_state.h
index 11dc00f84151019a48596d36ec5f9d8dfc9eb3d8..ac8abd961076ff91f7b4c36f10718a2df673689b 100644
--- a/components/payments/content/payment_request_state.h
+++ b/components/payments/content/payment_request_state.h
@@ -21,6 +21,7 @@ class PersonalDataManager;
 namespace payments {
 
 class PaymentRequestSpec;
+class PaymentRequestDelegate;
 
 // Keeps track of the information currently selected by the user and whether the
 // user is ready to pay. Uses information from the PaymentRequestSpec, which is
@@ -45,6 +46,7 @@ class PaymentRequestState : public PaymentInstrument::Delegate {
     // Called when the PaymentResponse is available.
     virtual void OnPaymentResponseAvailable(
         mojom::PaymentResponsePtr response) = 0;
+    virtual PaymentRequestDelegate* GetPaymentRequestDelegate() = 0;
 
    protected:
     virtual ~Delegate() {}