Increase Web Notification timeout to 20 seconds

ui/message_center/message_center_style.h

 // 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.
 
 #ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/size.h"
@@ skipping 83 matching lines @@
 MESSAGE_CENTER_EXPORT gfx::Size GetImageSizeForContainerSize(
     const gfx::Size& container_size,
     const gfx::Size& image_size);
 
 extern const int kNotificationMaximumImageHeight;  // For image notifications.
 extern const size_t kNotificationMaximumItems;     // For list notifications.
 
 // Timing.
 extern const int kAutocloseDefaultDelaySeconds;
 extern const int kAutocloseHighPriorityDelaySeconds;
+extern const int kAutocloseWebNotificationDelaySeconds;
 
 // Buttons.
 const int kButtonHeight = 38;              // In DIPs.
 const int kButtonHorizontalPadding = 16;   // In DIPs.
 const int kButtonIconTopPadding = 11;      // In DIPs.
 const int kButtonIconToTitlePadding = 16;  // In DIPs.
 
 #if !defined(OS_LINUX) || defined(USE_AURA)
 const SkColor kButtonSeparatorColor = SkColorSetRGB(234, 234, 234);
 const SkColor kHoveredButtonBackgroundColor = SkColorSetRGB(243, 243, 243);
@@ skipping 24 matching lines @@
 
 extern const SkColor kShadowColor;           // Shadow in the tray.
 
 extern const SkColor kMessageCenterBackgroundColor;
 extern const SkColor kFooterDelimiterColor;  // Separator color for the tray.
 extern const SkColor kFooterTextColor;       // Text color for tray labels.
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_