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

content/browser/service_worker/service_worker_stream_reader.h

-// Copyright 2016 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.
-
-#ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STREAM_READER_H_
-#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STREAM_READER_H_
-
-#include "content/browser/service_worker/service_worker_url_request_job.h"
-#include "content/browser/streams/stream_read_observer.h"
-#include "content/browser/streams/stream_register_observer.h"
-#include "net/url_request/url_request.h"
-
-namespace net {
-class IOBuffer;
-}
-
-namespace content {
-
-class ServiceWorkerVersion;
-
-// Reads a stream response for ServiceWorkerURLRequestJob.
-// Owned by ServiceWorkerURLRequestJob.
-class ServiceWorkerStreamReader : public StreamReadObserver,
-                                  public StreamRegisterObserver {
- public:
-  // |streaming_version| is the ServiceWorkerVersion that must be kept alive
-  // while the response is being read.
-  ServiceWorkerStreamReader(
-      ServiceWorkerURLRequestJob* owner,
-      scoped_refptr<ServiceWorkerVersion> streaming_version);
-  ~ServiceWorkerStreamReader() override;
-
-  // Starts reading the stream. owner_->OnResponseStarted will be called when
-  // the response starts.
-  void Start(const GURL& stream_url);
-
-  // Same as URLRequestJob::ReadRawData. If ERR_IO_PENDING is returned,
-  // owner_->OnReadRawDataComplete will be called when the read completes.
-  int ReadRawData(net::IOBuffer* buf, int buf_size);
-
-  // StreamObserver override:
-  void OnDataAvailable(Stream* stream) override;
-
-  // StreamRegisterObserver override:
-  void OnStreamRegistered(Stream* stream) override;
-
- private:
-  ServiceWorkerURLRequestJob* owner_;
-
-  scoped_refptr<Stream> stream_;
-  GURL waiting_stream_url_;
-  scoped_refptr<net::IOBuffer> stream_pending_buffer_;
-  int stream_pending_buffer_size_;
-
-  scoped_refptr<ServiceWorkerVersion> streaming_version_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_STREAM_READER_H_