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

content/common/service_worker/service_worker_messages.h

Index: content/common/service_worker/service_worker_messages.h
diff --git a/content/common/service_worker/service_worker_messages.h b/content/common/service_worker/service_worker_messages.h
index 0f0356ab93655c49d50bcb16c33383429a234017..dbe2010e461c0f847d2da4870df3877977dacbc5 100644
--- a/content/common/service_worker/service_worker_messages.h
+++ b/content/common/service_worker/service_worker_messages.h
@@ -92,7 +92,6 @@ IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerResponse)
   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)
@@ -245,9 +244,10 @@ IPC_MESSAGE_ROUTED4(ServiceWorkerHostMsg_InstallEventFinished,
                     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 */)