[Downloads] Introduce GUIDs for downloads.

chrome/browser/download/download_history.cc

 // 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.
 
 // DownloadHistory manages persisting DownloadItems to the history service by
 // observing a single DownloadManager and all its DownloadItems using an
 // AllDownloadItemNotifier.
 //
 // DownloadHistory decides whether and when to add items to, remove items from,
 // and update items in the database. DownloadHistory uses DownloadHistoryData to
@@ skipping 113 matching lines @@
     by_ext_id = by_ext->id();
     by_ext_name = by_ext->name();
   }
 #endif
 
   return history::DownloadRow(
       item->GetFullPath(),
       item->GetTargetFilePath(),
       item->GetUrlChain(),
       item->GetReferrerUrl(),
+      std::string(),  // HTTP method (not available yet)
       item->GetMimeType(),
       item->GetOriginalMimeType(),
       item->GetStartTime(),
       item->GetEndTime(),
       item->GetETag(),
       item->GetLastModifiedTime(),
       item->GetReceivedBytes(),
       item->GetTotalBytes(),
       history::ToHistoryDownloadState(item->GetState()),
       history::ToHistoryDownloadDangerType(item->GetDangerType()),
       history::ToHistoryDownloadInterruptReason(item->GetLastReason()),
+      std::string(),  // Hash value (not available yet)
       history::ToHistoryDownloadId(item->GetId()),
+      item->GetGuid(),
       item->GetOpened(),
       by_ext_id,
       by_ext_name);
 }
 
 bool ShouldUpdateHistory(const history::DownloadRow* previous,
                          const history::DownloadRow& current) {
-  // Ignore url, referrer, mime_type, original_mime_type, start_time,
-  // id, db_handle, which don't change.
+  // Ignore url_chain, referrer, http_method, mime_type, original_mime_type,
+  // start_time, id, guid, which don't change.
   return ((previous == NULL) ||
           (previous->current_path != current.current_path) ||
           (previous->target_path != current.target_path) ||
           (previous->end_time != current.end_time) ||
           (previous->received_bytes != current.received_bytes) ||
           (previous->total_bytes != current.total_bytes) ||
           (previous->etag != current.etag) ||
           (previous->last_modified != current.last_modified) ||
           (previous->state != current.state) ||
           (previous->danger_type != current.danger_type) ||
           (previous->interrupt_reason != current.interrupt_reason) ||
+          (previous->hash != current.hash) ||
           (previous->opened != current.opened) ||
           (previous->by_ext_id != current.by_ext_id) ||
           (previous->by_ext_name != current.by_ext_name));
 }
 
 typedef std::vector<history::DownloadRow> InfoVector;
 
 }  // anonymous namespace
 
 DownloadHistory::HistoryAdapter::HistoryAdapter(
@@ skipping 81 matching lines @@
 
 void DownloadHistory::QueryCallback(scoped_ptr<InfoVector> infos) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   // ManagerGoingDown() may have happened before the history loaded.
   if (!notifier_.GetManager())
     return;
   for (InfoVector::const_iterator it = infos->begin();
        it != infos->end(); ++it) {
     loading_id_ = history::ToContentDownloadId(it->id);
     content::DownloadItem* item = notifier_.GetManager()->CreateDownloadItem(
+        it->guid,
         loading_id_,
         it->current_path,
         it->target_path,
         it->url_chain,
         it->referrer_url,
         it->mime_type,
         it->original_mime_type,
         it->start_time,
         it->end_time,
         it->etag,
@@ skipping 183 matching lines @@
   removing_ids_.insert(download_id);
 }
 
 void DownloadHistory::RemoveDownloadsBatch() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   IdSet remove_ids;
   removing_ids_.swap(remove_ids);
   history_->RemoveDownloads(remove_ids);
   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadsRemoved(remove_ids));
 }