[ServiceWorker] Convert ping-pong IPC into mojo interface ServiceWorkerEventDispatcher

content/renderer/service_worker/service_worker_context_client.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/service_worker/service_worker_context_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/lazy_instance.h"
@@ skipping 401 matching lines @@
                         OnOpenWindowError)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_FocusClientResponse,
                         OnFocusClientResponse)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_NavigateClientResponse,
                         OnNavigateClientResponse)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_NavigateClientError,
                         OnNavigateClientError)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_DidSkipWaiting, OnDidSkipWaiting)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_DidClaimClients, OnDidClaimClients)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_ClaimClientsError, OnClaimClientsError)
-    IPC_MESSAGE_HANDLER(ServiceWorkerMsg_Ping, OnPing);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   DCHECK(handled);
 }
 
 blink::WebURL ServiceWorkerContextClient::scope() const {
   return service_worker_scope_;
 }
 
 void ServiceWorkerContextClient::getClient(
@@ skipping 823 matching lines @@
       context_->claim_clients_callbacks.Lookup(request_id);
   if (!callbacks) {
     NOTREACHED() << "Got stray response: " << request_id;
     return;
   }
   callbacks->onError(blink::WebServiceWorkerError(
       error_type, blink::WebString::fromUTF16(message)));
   context_->claim_clients_callbacks.Remove(request_id);
 }
 
-void ServiceWorkerContextClient::OnPing() {
-  Send(new ServiceWorkerHostMsg_Pong(GetRoutingID()));
+void ServiceWorkerContextClient::Ping(const PingCallback& callback) {
+  callback.Run();
 }
 
 void ServiceWorkerContextClient::OnNavigationPreloadResponse(
     int fetch_event_id,
     std::unique_ptr<blink::WebURLResponse> response,
     std::unique_ptr<blink::WebDataConsumerHandle> data_consumer_handle) {
   proxy_->onNavigationPreloadResponse(fetch_event_id, std::move(response),
                                       std::move(data_consumer_handle));
 }
 
@@ skipping 10 matching lines @@
 }
 
 base::WeakPtr<ServiceWorkerContextClient>
 ServiceWorkerContextClient::GetWeakPtr() {
   DCHECK(worker_task_runner_->RunsTasksOnCurrentThread());
   DCHECK(context_);
   return context_->weak_factory.GetWeakPtr();
 }
 
 }  // namespace content