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

content/browser/service_worker/embedded_worker_test_helper.cc

 // Copyright 2014 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/browser/service_worker/embedded_worker_test_helper.h"
 
 #include <map>
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 201 matching lines @@
   }
 
   void DispatchExtendableMessageEvent(
       mojom::ExtendableMessageEventPtr event,
       const DispatchExtendableMessageEventCallback& callback) override {
     if (!helper_)
       return;
     helper_->OnExtendableMessageEventStub(std::move(event), callback);
   }
 
+  void Ping(const PingCallback& callback) override { callback.Run(); }
+
  private:
   base::WeakPtr<EmbeddedWorkerTestHelper> helper_;
   const int thread_id_;
 };
 
 EmbeddedWorkerTestHelper::EmbeddedWorkerTestHelper(
     const base::FilePath& user_data_directory)
     : browser_context_(new TestBrowserContext),
       render_process_host_(new MockRenderProcessHost(browser_context_.get())),
       new_render_process_host_(
@@ skipping 432 matching lines @@
                  service_manager::InterfaceProviderSpec());
 
   std::unique_ptr<service_manager::InterfaceProvider> remote_interfaces(
       new service_manager::InterfaceProvider);
   remote_interfaces->Bind(std::move(interfaces));
   rph->SetRemoteInterfaces(std::move(remote_interfaces));
   return registry;
 }
 
 }  // namespace content