Add support to sha256 hash the downloaded file....

chrome/browser/download/download_file.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/download/download_file.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/history/download_create_info.h"
 
 DownloadFile::DownloadFile(const DownloadCreateInfo* info,
-                           DownloadManager* download_manager)
+                           DownloadManager* download_manager,
+                           bool calculate_hash)
     : BaseFile(info->save_info.file_path,
                info->url,
                info->referrer_url,
                info->received_bytes,
-               info->save_info.file_stream),
+               info->save_info.file_stream,
+               calculate_hash),
       id_(info->download_id),
       child_id_(info->child_id),
       request_id_(info->request_id),
       download_manager_(download_manager) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-
 }
 
 DownloadFile::~DownloadFile() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 }
 
 void DownloadFile::DeleteCrDownload() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   FilePath crdownload = download_util::GetCrDownloadPath(full_path_);
   file_util::Delete(crdownload, false);
@@ skipping 21 matching lines @@
                             " child_id_ = " "%d"
                             " request_id_ = " "%d"
                             " Base File = %s"
                             " }",
                             full_path_.value().c_str(),
                             id_,
                             child_id_,
                             request_id_,
                             BaseFile::DebugString().c_str());
 }