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

chrome/browser/history/history.cc

Index: chrome/browser/history/history.cc
diff --git a/chrome/browser/history/history.cc b/chrome/browser/history/history.cc
index 6957e3a402fbf86d9f66abcde4eb2bf18753a260..5cdbad0849bc38c0b316f1ae1a7049f4e56a5272 100644
--- a/chrome/browser/history/history.cc
+++ b/chrome/browser/history/history.cc
@@ -543,9 +543,10 @@ void HistoryService::CleanUpInProgressEntries() {
 // operation, so we don't need to be called back.
 void HistoryService::UpdateDownload(int64 received_bytes,
                                     int32 state,
+                                    const base::Time& end_time,
                                     int64 db_handle) {
   ScheduleAndForget(PRIORITY_NORMAL, &HistoryBackend::UpdateDownload,
-                    received_bytes, state, db_handle);
+                    received_bytes, state, end_time, db_handle);
 }
 
 void HistoryService::UpdateDownloadPath(const FilePath& path,
@@ -567,6 +568,11 @@ void HistoryService::RemoveDownloadsBetween(Time remove_begin,
                     remove_end);
 }
 
+void HistoryService::MarkDownloadOpened(int64 db_handle) {
+  ScheduleAndForget(PRIORITY_NORMAL,
+                    &HistoryBackend::MarkDownloadOpened, db_handle);
+}
+
 HistoryService::Handle HistoryService::QueryHistory(
     const string16& text_query,
     const history::QueryOptions& options,