Add new UMA stats to get a handle on Downloads UI Usage

chrome/browser/history/history_backend.cc

 // 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.
 
 #include "chrome/browser/history/history_backend.h"
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 1100 matching lines @@
 // Clean up entries that has been corrupted (because of the crash, for example).
 void HistoryBackend::CleanUpInProgressEntries() {
   if (db_.get()) {
     // If some "in progress" entries were not updated when Chrome exited, they
     // need to be cleaned up.
     db_->CleanUpInProgressEntries();
   }
 }
 
 // Update a particular download entry.
-void HistoryBackend::UpdateDownload(int64 received_bytes,
-                                    int32 state,
-                                    int64 db_handle) {
+void HistoryBackend::UpdateDownload(history::DownloadItemData data) {
   if (db_.get())
-    db_->UpdateDownload(received_bytes, state, db_handle);
+    db_->UpdateDownload(data);
 }
 
 // Update the path of a particular download entry.
 void HistoryBackend::UpdateDownloadPath(const FilePath& path,
                                         int64 db_handle) {
   if (db_.get())
     db_->UpdateDownloadPath(path, db_handle);
 }
 
 // Create a new download entry and pass back the db_handle to it.
@@ skipping 1115 matching lines @@
   return true;
 }
 
 BookmarkService* HistoryBackend::GetBookmarkService() {
   if (bookmark_service_)
     bookmark_service_->BlockTillLoaded();
   return bookmark_service_;
 }
 
 }  // namespace history