ServiceWorker: Use mojo's data pipe for respondWith(stream)

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 74 matching lines @@
                           content::SERVICE_WORKER_FETCH_EVENT_LAST)
 
 IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerResponse)
   IPC_STRUCT_TRAITS_MEMBER(url_list)
   IPC_STRUCT_TRAITS_MEMBER(status_code)
   IPC_STRUCT_TRAITS_MEMBER(status_text)
   IPC_STRUCT_TRAITS_MEMBER(response_type)
   IPC_STRUCT_TRAITS_MEMBER(headers)
   IPC_STRUCT_TRAITS_MEMBER(blob_uuid)
   IPC_STRUCT_TRAITS_MEMBER(blob_size)
-  IPC_STRUCT_TRAITS_MEMBER(stream_url)
   IPC_STRUCT_TRAITS_MEMBER(error)
   IPC_STRUCT_TRAITS_MEMBER(response_time)
   IPC_STRUCT_TRAITS_MEMBER(is_in_cache_storage)
   IPC_STRUCT_TRAITS_MEMBER(cache_storage_cache_name)
   IPC_STRUCT_TRAITS_MEMBER(cors_exposed_header_names)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerObjectInfo)
   IPC_STRUCT_TRAITS_MEMBER(handle_id)
   IPC_STRUCT_TRAITS_MEMBER(url)
@@ skipping 132 matching lines @@
                      int /* handle_id */)
 
 // Informs the browser that event handling has finished.
 // Routed to the target ServiceWorkerVersion.
 IPC_MESSAGE_ROUTED4(ServiceWorkerHostMsg_InstallEventFinished,
                     int /* request_id */,
                     blink::WebServiceWorkerEventResult,
                     bool /* has_fetch_event_handler */,
                     base::Time /* dispatch_event_time */)
 
-IPC_MESSAGE_ROUTED4(ServiceWorkerHostMsg_FetchEventResponse,
+// Returns the response as the result of fetch event. This is used only for blob
+// to keep the IPC ordering. For stream, no body and fallback, mojo IPC is used.

[falken, 2017/04/18 05:05:33]

The second sentence is difficult to parse :)

"Mojo IPC is used when the response body is a stream or is empty, and for the
fallback-to-network response."

[shimazu, 2017/04/19 05:49:46]

Done.

+IPC_MESSAGE_ROUTED3(ServiceWorkerHostMsg_FetchEventResponse,
                     int /* fetch_event_id */,
-                    content::ServiceWorkerFetchEventResult,
                     content::ServiceWorkerResponse,
                     base::Time /* dispatch_event_time */)
 
 // 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,
@@ skipping 252 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 */)