PaymentApp: Implement InvokePaymentApp() in browser side.

content/browser/service_worker/embedded_worker_test_helper.h

Index: content/browser/service_worker/embedded_worker_test_helper.h
diff --git a/content/browser/service_worker/embedded_worker_test_helper.h b/content/browser/service_worker/embedded_worker_test_helper.h
index 108327d1f66b3f185b198b5921e54e7cf8d12e97..046f59de916af27c7962c5630b54376ee255f522 100644
--- a/content/browser/service_worker/embedded_worker_test_helper.h
+++ b/content/browser/service_worker/embedded_worker_test_helper.h
@@ -195,6 +195,10 @@ class EmbeddedWorkerTestHelper : public IPC::Sender,
   virtual void OnPushEvent(int embedded_worker_id,
                            int request_id,
                            const PushEventPayload& payload);
+  virtual void OnPaymentRequestEvent(
+      payments::mojom::PaymentAppRequestDataPtr data,
+      const mojom::ServiceWorkerEventDispatcher::
+          DispatchPaymentRequestEventCallback& callback);
 
   // These functions simulate sending an EmbeddedHostMsg message to the
   // browser.
@@ -231,6 +235,10 @@ class EmbeddedWorkerTestHelper : public IPC::Sender,
                         mojom::FetchEventPreloadHandlePtr preload_handle,
                         const FetchCallback& callback);
   void OnPushEventStub(int request_id, const PushEventPayload& payload);
+  void OnPaymentRequestEventStub(
+      payments::mojom::PaymentAppRequestDataPtr data,
+      const mojom::ServiceWorkerEventDispatcher::
+          DispatchPaymentRequestEventCallback& callback);
 
   MessagePortMessageFilter* NewMessagePortMessageFilter();