Separate PaymentRequest initialization and display.

third_party/WebKit/public/platform/modules/payments/payment_request.mojom

Index: third_party/WebKit/public/platform/modules/payments/payment_request.mojom
diff --git a/third_party/WebKit/public/platform/modules/payments/payment_request.mojom b/third_party/WebKit/public/platform/modules/payments/payment_request.mojom
index 28f741eaabe0600adc193abead86a678c192eba4..dc29676287b9305099250111afb74bb15a1538b9 100644
--- a/third_party/WebKit/public/platform/modules/payments/payment_request.mojom
+++ b/third_party/WebKit/public/platform/modules/payments/payment_request.mojom
@@ -130,10 +130,11 @@ enum PaymentComplete {
 };
 
 interface PaymentRequest {
-  SetClient(PaymentRequestClient client);
-  Show(array<PaymentMethodData> methodData,
+  Init(PaymentRequestClient client,
+       array<PaymentMethodData> methodData,
        PaymentDetails details,
        PaymentOptions options);
+  Show();
   UpdateWith(PaymentDetails details);
   Abort();
   Complete(PaymentComplete result);