Add an empty message to the notification center.

ui/message_center/views/message_center_view.cc

 // Copyright (c) 2013 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/views/message_center_view.h"
 
 #include <list>
 #include <map>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 33 matching lines @@
 
 namespace message_center {
 
 namespace {
 
 const SkColor kNoNotificationsTextColor = SkColorSetRGB(0xb4, 0xb4, 0xb4);
 #if defined(OS_LINUX) && defined(OS_CHROMEOS)
 const SkColor kTransparentColor = SkColorSetARGB(0, 0, 0, 0);
 #endif
 const int kAnimateClearingNextNotificationDelayMS = 40;
-const int kMinScrollViewHeight = 100;
 
 const int kDefaultAnimationDurationMs = 120;
 const int kDefaultFrameRateHz = 60;
 }  // namespace
 
 // BoundedScrollView ///////////////////////////////////////////////////////////
 
 // A custom scroll view whose height has a minimum and maximum value and whose
 // scroll bar disappears when not needed.
 class BoundedScrollView : public views::ScrollView {
@@ skipping 1013 matching lines @@
   scroller_->InvalidateLayout();
   PreferredSizeChanged();
   Layout();
 }
 
 void MessageCenterView::SetNotificationViewForTest(MessageView* view) {
   message_list_view_->AddNotificationAt(view, 0);
 }
 
 }  // namespace message_center