Made notification center notifications collapsed and expandable.

ui/message_center/message_center_bubble.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_BUBBLE_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_BUBBLE_H_
 
 #include "ui/message_center/message_bubble_base.h"
 #include "ui/message_center/message_center_export.h"
 #include "ui/message_center/notification_list.h"
 
 namespace message_center {
 
-class MessageCenterContentsView;
+class MessageCenterView;

[dharcourt, 2013/02/23 04:32:00]

I renamed "MessageCenterContentsView" to "MessageCenterView" and
"ScrollContentView" to "MessagesView" so their names reflect what they are
rather than how they're used (for example MessagesView displays a list of
messages whether it's used in a scroll view or not, so its name doesn't need to
include "ScrollContent").

This increases encapsulation and should simplify things for people reading this
code for the first time (for example they can read the MessagesView code without
having that class' name make them look for its scroll-related code).

MessageCenterView is still not as encapsulated as I'd like and it remains
coupled to MessageCenterBubble, but if we replace that with delegation we could
move MessageCenterView and MessagesView to a separate message_center_view.{h,cc}
and have that be message center UI code that's totally independent of where it's
used.

 
 // Bubble for message center.
 class MESSAGE_CENTER_EXPORT MessageCenterBubble : public MessageBubbleBase {
  public:
   explicit MessageCenterBubble(NotificationList::Delegate* delegate);
 
   virtual ~MessageCenterBubble();
 
   // Overridden from MessageBubbleBase.
   virtual views::TrayBubbleView::InitParams GetInitParams(
       views::TrayBubbleView::AnchorAlignment anchor_alignment) OVERRIDE;
   virtual void InitializeContents(views::TrayBubbleView* bubble_view) OVERRIDE;
   virtual void OnBubbleViewDestroyed() OVERRIDE;
   virtual void UpdateBubbleView() OVERRIDE;
   virtual void OnMouseEnteredView() OVERRIDE;
   virtual void OnMouseExitedView() OVERRIDE;
 
   size_t NumMessageViewsForTest() const;
 
  private:
-  MessageCenterContentsView* contents_view_;
+  MessageCenterView* contents_view_;
 
   // The maximum height
   int max_height_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterBubble);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_MESSAGE_CENTER_BUBBLE_H_