Added member data to classes to support download resumption.

content/browser/download/download_file.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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 39 matching lines @@
   virtual void AnnotateWithSourceInformation() = 0;
 
   virtual FilePath FullPath() const = 0;
   virtual bool InProgress() const = 0;
   virtual int64 BytesSoFar() const = 0;
 
   // Set |hash| with sha256 digest for the file.
   // Returns true if digest is successfully calculated.
   virtual bool GetSha256Hash(std::string* hash) = 0;
 
+  // Returns the current (intermediate) state of the hash as a byte string.
+  virtual std::string GetSha256HashState() = 0;
+
   // Cancels the download request associated with this file.
   virtual void CancelDownloadRequest() = 0;
 
   virtual int Id() const = 0;
   virtual DownloadManager* GetDownloadManager() = 0;
   virtual const DownloadId& GlobalId() const = 0;
 
   virtual std::string DebugString() const = 0;
 
   // Appends the passed-in |number| between parenthesis to the |path| before
@@ skipping 12 matching lines @@
   // Same as GetUniquePathNumber, except that it also checks the existence
   // of it with the given suffix.
   // If |path| does not exist, 0 is returned.  If it fails to find such
   // a number, -1 is returned.
   static int GetUniquePathNumberWithSuffix(
       const FilePath& path,
       const FilePath::StringType& suffix);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_H_