WIP - loop in LayoutManager for preferred size changes

ui/views/layout/layout_manager.h

 // Copyright (c) 2011 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_VIEWS_LAYOUT_LAYOUT_MANAGER_H_
 #define UI_VIEWS_LAYOUT_LAYOUT_MANAGER_H_
 
 #include "ui/views/views_export.h"
 
 namespace gfx {
@@ skipping 35 matching lines @@
 
   // Returns the preferred height for the specified width. The default
   // implementation returns the value from GetPreferredSize.
   virtual int GetPreferredHeightForWidth(View* host, int width);
 
   // Notification that a view has been added.
   virtual void ViewAdded(View* host, View* view);
 
   // Notification that a view has been removed.
   virtual void ViewRemoved(View* host, View* view);
+
+  // FIXME
+  virtual void OnChildPreferredSizeChanged(View* host, View* child);
+
+ protected:
+  void HostPreferredSizeShouldChange(View* host);

[Evan Stade, 2013/05/08 22:31:42]

this makes it so that it's no longer just an interface. I could change this by
friending every LayoutManager class that needs access to PreferredSizeChanged()
and all that, or just making the necessary methods public. Let me know which you
prefer.

 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_LAYOUT_LAYOUT_MANAGER_H_