Use IPC to wait for download in DownloadTest.

chrome/common/notification_type.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 931 matching lines @@
 
     // The sync service is finished the configuration process.
     SYNC_CONFIGURE_DONE,
 
     // Cookies -----------------------------------------------------------------
 
     // Sent when a cookie changes. The source is a Profile object, the details
     // are a ChromeCookieDetails object.
     COOKIE_CHANGED,
 
+    // Downloads ---------------------------------------------------------------
+
+    // Sent when the download shelf appears or disappears. The source is the
+    // Browser object.
+    DOWNLOAD_SHELF_VISIBILITY_CHANGED,
+
 #if defined(OS_CHROMEOS)
     // Sent when a chromium os user logs in.
     LOGIN_USER_CHANGED,
 
     // Sent when user image is updated.
     LOGIN_USER_IMAGE_CHANGED,
 
     // Sent when a chromium os user attempts to log in.  The source is
     // all and the details are AuthenticationNotificationDetails.
     LOGIN_AUTHENTICATION,
@@ skipping 44 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_