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

chrome/browser/download/download_history.cc

Index: chrome/browser/download/download_history.cc
diff --git a/chrome/browser/download/download_history.cc b/chrome/browser/download/download_history.cc
index 426a4345ff1717053737253bfb607ed3f27efaca..e86dddb10e43ffa107f5740e30ce15881b7e8e31 100644
--- a/chrome/browser/download/download_history.cc
+++ b/chrome/browser/download/download_history.cc
@@ -110,10 +110,7 @@ void DownloadHistory::UpdateEntry(DownloadItem* download_item) {
   HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
   if (!hs)
     return;
-
-  hs->UpdateDownload(download_item->received_bytes(),
-                     download_item->state(),
-                     download_item->db_handle());
+  hs->UpdateDownload(download_item->GetPersistentStoreInfo());
 }
 
 void DownloadHistory::UpdateDownloadPath(DownloadItem* download_item,