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

content/common/service_worker/service_worker_messages.h

 // 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.
 
 // Message definition file, included multiple times, hence no include guard.
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
@@ skipping 233 matching lines @@
                     blink::WebServiceWorkerEventResult,
                     bool /* has_fetch_event_handler */,
                     base::Time /* dispatch_event_time */)
 
 IPC_MESSAGE_ROUTED4(ServiceWorkerHostMsg_FetchEventResponse,
                     int /* fetch_event_id */,
                     content::ServiceWorkerFetchEventResult,
                     content::ServiceWorkerResponse,
                     base::Time /* dispatch_event_time */)
 
-// Responds to a Ping from the browser.
-// Routed to the target ServiceWorkerVersion.
-IPC_MESSAGE_ROUTED0(ServiceWorkerHostMsg_Pong)
-
 // Asks the browser to retrieve client of the sender ServiceWorker.
 IPC_MESSAGE_ROUTED2(ServiceWorkerHostMsg_GetClient,
                     int /* request_id */,
                     std::string /* client_uuid */)
 
 // Asks the browser to retrieve clients of the sender ServiceWorker.
 IPC_MESSAGE_ROUTED2(ServiceWorkerHostMsg_GetClients,
                     int /* request_id */,
                     content::ServiceWorkerClientQueryOptions)
 
@@ skipping 215 matching lines @@
                      int /* request_id */)
 IPC_MESSAGE_CONTROL1(ServiceWorkerMsg_DidSkipWaiting,
                      int /* request_id */)
 IPC_MESSAGE_CONTROL1(ServiceWorkerMsg_DidClaimClients,
                      int /* request_id */)
 IPC_MESSAGE_CONTROL3(ServiceWorkerMsg_ClaimClientsError,
                      int /* request_id */,
                      blink::WebServiceWorkerError::ErrorType /* code */,
                      base::string16 /* message */)
 
-// Sent via EmbeddedWorker to Ping the worker, expecting a Pong in response.
-IPC_MESSAGE_CONTROL0(ServiceWorkerMsg_Ping)
-
 // Sent via EmbeddedWorker as a response of GetClient.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_DidGetClient,
                      int /* request_id */,
                      content::ServiceWorkerClientInfo)
 
 // Sent via EmbeddedWorker as a response of GetClients.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_DidGetClients,
                      int /* request_id */,
                      std::vector<content::ServiceWorkerClientInfo>)
 
@@ skipping 14 matching lines @@
 
 // Sent via EmbeddedWorker as a response of NavigateClient.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_NavigateClientResponse,
                      int /* request_id */,
                      content::ServiceWorkerClientInfo /* client */)
 
 // Sent via EmbeddedWorker as an error response of NavigateClient.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_NavigateClientError,
                      int /* request_id */,
                      GURL /* url */)