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 9a6dc603b74d7bc1e86162754cee6c2c62ed980b..125215d9fc45806daa3bce0493fbe6997cc29952 100644
--- a/content/browser/service_worker/embedded_worker_test_helper.h
+++ b/content/browser/service_worker/embedded_worker_test_helper.h
@@ -194,6 +194,10 @@ class EmbeddedWorkerTestHelper : public IPC::Sender,
       const PushEventPayload& payload,
       const mojom::ServiceWorkerEventDispatcher::DispatchPushEventCallback&
           callback);
+  virtual void OnPaymentRequestEvent(
+      payments::mojom::PaymentAppRequestDataPtr data,
+      const mojom::ServiceWorkerEventDispatcher::
+          DispatchPaymentRequestEventCallback& callback);
 
   // These functions simulate sending an EmbeddedHostMsg message through the
   // legacy IPC system to the browser.
@@ -235,6 +239,10 @@ class EmbeddedWorkerTestHelper : public IPC::Sender,
       const PushEventPayload& payload,
       const mojom::ServiceWorkerEventDispatcher::DispatchPushEventCallback&
           callback);
+  void OnPaymentRequestEventStub(
+      payments::mojom::PaymentAppRequestDataPtr data,
+      const mojom::ServiceWorkerEventDispatcher::
+          DispatchPaymentRequestEventCallback& callback);
 
   MessagePortMessageFilter* NewMessagePortMessageFilter();