Stop notifications from being clipped on resize.

ui/message_center/views/message_list_view.h

 // Copyright (c) 2015 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_VIEWS_MESSAGE_LIST_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_
 
 #include <list>
 #include <set>
 
@@ skipping 61 matching lines @@
 
   bool IsValidChild(const views::View* child) const;
   void DoUpdateIfPossible();
 
   // Animates all notifications below target upwards to align with the top of
   // the last closed notification.
   void AnimateNotificationsBelowTarget();
   // Animates all notifications above target downwards to align with the top of
   // the last closed notification.
   void AnimateNotificationsAboveTarget();
+  // Computes reposition offsets for |AnimateNotificationsAboveTarget|.
+  std::vector<int> ComputeRepositionOffsets(const std::vector<int>& heights,

[xiyuan, 2017/02/16 16:57:46]

nit: #include <vector> ?

[Eliot Courtney, 2017/02/17 07:49:49]

Done.

+                                            const std::vector<bool>& deleting,
+                                            int target_index,
+                                            int padding);
 
   // Schedules animation for a child to the specified position. Returns false
   // if |child| will disappear after the animation.
   bool AnimateChild(views::View* child,
                     int top,
                     int height,
                     bool animate_even_on_move);
 
   // Animate clearing one notification.
   void AnimateClearingOneNotification();
@@ skipping 16 matching lines @@
   // This is just for tests and has no setter.
   bool quit_message_loop_after_animation_for_test_;
 
   base::WeakPtrFactory<MessageListView> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(MessageListView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_