Added member data to classes to support download resumption.

content/browser/download/download_manager.h

 // Copyright (c) 2011 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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 87 matching lines @@
   // Returns all non-temporary downloads matching |query|. Empty query matches
   // everything.
   virtual void SearchDownloads(const string16& query,
                                DownloadVector* result) = 0;
 
   // Returns true if initialized properly.
   virtual bool Init(content::BrowserContext* browser_context) = 0;
 
   // Notifications sent from the download thread to the UI thread
   virtual void StartDownload(int32 id) = 0;
-  virtual void UpdateDownload(int32 download_id, int64 size) = 0;
+  virtual void UpdateDownload(int32 download_id,
+                              int64 size,
+                              std::string hash_state) = 0;
 
   // |download_id| is the ID of the download.
   // |size| is the number of bytes that have been downloaded.
   // |hash| is sha256 hash for the downloaded file. It is empty when the hash
   // is not available.
   virtual void OnResponseCompleted(int32 download_id, int64 size,
                            const std::string& hash) = 0;
 
   // Offthread target for cancelling a particular download.  Will be a no-op
   // if the download has already been cancelled.
   virtual void CancelDownload(int32 download_id) = 0;
 
   // Called when there is an error in the download.
   // |download_id| is the ID of the download.
   // |size| is the number of bytes that are currently downloaded.
+  // |hash_state| is the current state of the hash of the data that has been
+  // downloaded.
   // |reason| is a download interrupt reason code.
-  virtual void OnDownloadInterrupted(int32 download_id, int64 size,
-                             InterruptReason reason) = 0;
+  virtual void OnDownloadInterrupted(int32 download_id,
+                                     int64 size,
+                                     std::string hash_state,
+                                     InterruptReason reason) = 0;
 
   // Called from DownloadItem to handle the DownloadManager portion of a
   // Cancel; should not be called from other locations.
   virtual void DownloadCancelledInternal(DownloadItem* download) = 0;
 
   // Called from a view when a user clicks a UI button or link.
   virtual void RemoveDownload(int64 download_handle) = 0;
 
   // Determine if the download is ready for completion, i.e. has had
   // all data saved, and completed the filename determination and
@@ skipping 149 matching lines @@
   friend class DownloadManagerTest;
 
   friend class base::RefCountedThreadSafe<
       DownloadManager, content::BrowserThread::DeleteOnUIThread>;
   friend struct content::BrowserThread::DeleteOnThread<
       content::BrowserThread::UI>;
   friend class DeleteTask<DownloadManager>;
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_