Initial CL for Downloads resumption.

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 <map>
 #include <set>
 
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/synchronization/lock.h"
 #include "content/browser/download/download_item_impl_delegate.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/download_manager.h"
+#include "content/public/browser/download_url_parameters.h"
 
 namespace net {
 class BoundNetLog;
 }
 
 namespace content {
 class DownloadFileFactory;
 class DownloadItemFactory;
 class DownloadItemImpl;
 
@@ skipping 60 matching lines @@
   typedef std::vector<DownloadItemImpl*> DownloadItemImplVector;
 
   // For testing.
   friend class DownloadManagerTest;
   friend class DownloadTest;
 
   friend class base::RefCountedThreadSafe<DownloadManagerImpl>;
 
   virtual ~DownloadManagerImpl();
 
-  // Creates the download item.  Must be called on the UI thread.
-  virtual DownloadItemImpl* CreateDownloadItem(
-      DownloadCreateInfo* info, const net::BoundNetLog& bound_net_log);
+  // Retrieves the download item corresponding to the passed
+  // DownloadCreateInfo.  This will create the download item
+  // if this is a new download (common case) or retrieve an
+  // existing download item if this is a resuming download.
+  virtual DownloadItemImpl* GetOrCreateDownloadItem(DownloadCreateInfo* info);
 
   // Get next download id.
   DownloadId GetNextId();
 
   // Called on the FILE thread to check the existence of a downloaded file.
   void CheckForFileRemovalOnFileThread(int32 download_id, const FilePath& path);
 
   // Called on the UI thread if the FILE thread detects the removal of
   // the downloaded file. The UI thread updates the state of the file
   // and then notifies this update to the file's observer.
   void OnFileRemovalDetected(int32 download_id);
 
   // Remove from internal maps.
   int RemoveDownloadItems(const DownloadItemImplVector& pending_deletes);
 
   // Overridden from DownloadItemImplDelegate
   // (Note that |GetBrowserContext| are present in both interfaces.)
   virtual void DetermineDownloadTarget(
       DownloadItemImpl* item, const DownloadTargetCallback& callback) OVERRIDE;
   virtual bool ShouldCompleteDownload(
       DownloadItemImpl* item, const base::Closure& complete_callback) OVERRIDE;
   virtual bool ShouldOpenFileBasedOnExtension(const FilePath& path) OVERRIDE;
   virtual bool ShouldOpenDownload(
       DownloadItemImpl* item,
       const ShouldOpenDownloadCallback& callback) OVERRIDE;
   virtual void CheckForFileRemoval(DownloadItemImpl* download_item) OVERRIDE;
+  virtual void ResumeInterruptedDownload(
+      scoped_ptr<content::DownloadUrlParameters> params,
+      content::DownloadId id) OVERRIDE;
   virtual void DownloadOpened(DownloadItemImpl* download) OVERRIDE;
   virtual void DownloadRemoved(DownloadItemImpl* download) OVERRIDE;
   virtual void ShowDownloadInBrowser(DownloadItemImpl* download) OVERRIDE;
 
   // Factory for creation of downloads items.
   scoped_ptr<DownloadItemFactory> item_factory_;
 
   // Factory for the creation of download files.
   scoped_ptr<DownloadFileFactory> file_factory_;
 
@@ skipping 18 matching lines @@
   DownloadManagerDelegate* delegate_;
 
   net::NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_