Introduce ParallelDownloadJob.

content/browser/download/download_manager_impl.h

 // Copyright (c) 2012 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_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 22 matching lines @@
 }
 
 namespace content {
 class DownloadFileFactory;
 class DownloadItemFactory;
 class DownloadItemImpl;
 class DownloadRequestHandleInterface;
 class ResourceContext;
 
 class CONTENT_EXPORT DownloadManagerImpl : public DownloadManager,
+                                           public UrlDownloader::Delegate,
                                            private DownloadItemImplDelegate {
  public:
   using DownloadItemImplCreated = base::Callback<void(DownloadItemImpl*)>;
 
   // Caller guarantees that |net_log| will remain valid
   // for the lifetime of DownloadManagerImpl (until Shutdown() is called).
   DownloadManagerImpl(net::NetLog* net_log, BrowserContext* browser_context);
   ~DownloadManagerImpl() override;
 
   // Implementation functions (not part of the DownloadManager interface).
@@ skipping 51 matching lines @@
       DownloadDangerType danger_type,
       DownloadInterruptReason interrupt_reason,
       bool opened) override;
   int InProgressCount() const override;
   int NonMaliciousInProgressCount() const override;
   BrowserContext* GetBrowserContext() const override;
   void CheckForHistoryFilesRemoval() override;
   DownloadItem* GetDownload(uint32_t id) override;
   DownloadItem* GetDownloadByGuid(const std::string& guid) override;
 
+  // UrlDownloader::Delegate implementation.
+  void OnUrlDownloaderStarted(
+      std::unique_ptr<DownloadCreateInfo> download_create_info,
+      std::unique_ptr<ByteStreamReader> stream_reader,
+      const DownloadUrlParameters::OnStartedCallback& callback) override;
+  void OnUrlDownloaderStopped(UrlDownloader* downloader) override;
+
   // For testing; specifically, accessed from TestFileErrorInjector.
   void SetDownloadItemFactoryForTesting(
       std::unique_ptr<DownloadItemFactory> item_factory);
   void SetDownloadFileFactoryForTesting(
       std::unique_ptr<DownloadFileFactory> file_factory);
   virtual DownloadFileFactory* GetDownloadFileFactoryForTesting();
 
-  void RemoveUrlDownloader(UrlDownloader* downloader);
-
   // Helper function to initiate a download request. This function initiates
   // the download using functionality provided by the
   // ResourceDispatcherHostImpl::BeginURLRequest function. The function returns
   // the result of the downoad operation. Please see the
   // DownloadInterruptReason enum for information on possible return values.
   static DownloadInterruptReason BeginDownloadRequest(
       std::unique_ptr<net::URLRequest> url_request,
       const Referrer& referrer,
       ResourceContext* resource_context,
       bool is_content_initiated,
@@ skipping 100 matching lines @@
       url_downloaders_;
 
   base::WeakPtrFactory<DownloadManagerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_