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 1102 matching lines @@
   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,
+                                    const base::Time& end_time,
                                     int64 db_handle) {
   if (db_.get())
-    db_->UpdateDownload(received_bytes, state, db_handle);
+    db_->UpdateDownload(received_bytes, state, end_time, db_handle);
 }
 
 // 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 13 matching lines @@
   if (db_.get())
     db_->RemoveDownload(db_handle);
 }
 
 void HistoryBackend::RemoveDownloadsBetween(const Time remove_begin,
                                             const Time remove_end) {
   if (db_.get())
     db_->RemoveDownloadsBetween(remove_begin, remove_end);
 }
 
+void HistoryBackend::MarkDownloadOpened(int64 db_handle) {
+  if (db_.get())
+    db_->MarkDownloadOpened(db_handle);
+}
+
 void HistoryBackend::QueryHistory(scoped_refptr<QueryHistoryRequest> request,
                                   const string16& text_query,
                                   const QueryOptions& options) {
   if (request->canceled())
     return;
 
   TimeTicks beginning_time = TimeTicks::Now();
 
   if (db_.get()) {
     if (text_query.empty()) {
@@ skipping 1082 matching lines @@
   return true;
 }
 
 BookmarkService* HistoryBackend::GetBookmarkService() {
   if (bookmark_service_)
     bookmark_service_->BlockTillLoaded();
   return bookmark_service_;
 }
 
 }  // namespace history