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

chrome/browser/download/download_history.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/download/download_history.h"
 
 #include "base/logging.h"
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 #include "chrome/browser/history/history_marshaling.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 95 matching lines @@
   // incognito mode or if it hasn't been initialized in our database table.
   if (download_item->db_handle() <= DownloadItem::kUninitializedHandle)
     return;
 
   HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
   if (!hs)
     return;
 
   hs->UpdateDownload(download_item->received_bytes(),
                      download_item->state(),
+                     download_item->end_time(),
                      download_item->db_handle());
 }
 
 void DownloadHistory::UpdateDownloadPath(DownloadItem* download_item,
                                          const FilePath& new_path) {
   // No update necessary if the download was initiated while in incognito mode.
   if (download_item->db_handle() <= DownloadItem::kUninitializedHandle)
     return;
 
   HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
@@ skipping 29 matching lines @@
   VisitedBeforeRequestsMap::iterator request =
       visited_before_requests_.find(handle);
   DCHECK(request != visited_before_requests_.end());
   int32 download_id = request->second.first;
   VisitedBeforeDoneCallback* callback = request->second.second;
   visited_before_requests_.erase(request);
   callback->Run(download_id, found_visits && count &&
       (first_visit.LocalMidnight() < base::Time::Now().LocalMidnight()));
   delete callback;
 }
+
+void DownloadHistory::MarkDownloadOpened(int64 db_handle) {
+  // No update necessary if the download was initiated while in incognito mode.
+  if (db_handle <= DownloadItem::kUninitializedHandle)
+    return;
+
+  HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
+  if (hs)
+    hs->MarkDownloadOpened(db_handle);
+}