Increase Web Notification timeout to 20 seconds

ui/message_center/message_center_style.cc

 // Copyright (c) 2012 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 "ui/message_center/message_center_style.h"
 
 #include <algorithm>
 
 namespace message_center {
 
@@ skipping 36 matching lines @@
   }
 
   return scaled_size;
 }
 
 const size_t kNotificationMaximumItems = 5;
 
 // Timing.
 const int kAutocloseDefaultDelaySeconds = 8;
 const int kAutocloseHighPriorityDelaySeconds = 25;
+// Web notifications use a larger timeout for now, which improves re-engagement.
+// TODO(johnme): Use Finch to experiment with different values for this, then
+// consider replacing kAutocloseDefaultDelaySeconds with this.
+const int kAutocloseWebNotificationDelaySeconds = 20;
 
 // Colors.
 const SkColor kBackgroundLightColor = SkColorSetRGB(0xf1, 0xf1, 0xf1);
 const SkColor kBackgroundDarkColor = SkColorSetRGB(0xe7, 0xe7, 0xe7);
 const SkColor kShadowColor = SkColorSetARGB(0.3 * 255, 0, 0, 0);
 const SkColor kMessageCenterBackgroundColor = SkColorSetRGB(0xee, 0xee, 0xee);
 const SkColor kFooterDelimiterColor = SkColorSetRGB(0xcc, 0xcc, 0xcc);
 const SkColor kFooterTextColor = SkColorSetRGB(0x7b, 0x7b, 0x7b);
 
 }  // namespace message_center