WIP - loop in LayoutManager for preferred size changes

ui/views/layout/box_layout.cc

 // 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.
 
 #include "ui/views/layout/box_layout.h"
 
 #include "ui/gfx/rect.h"
 #include "ui/views/view.h"
 
 namespace views {
@@ skipping 82 matching lines @@
   }
 
   return GetPreferredSizeForChildWidth(host, width);
 }
 
 int BoxLayout::GetPreferredHeightForWidth(View* host, int width) {
   int child_width = width - NonChildSize(host).width();
   return GetPreferredSizeForChildWidth(host, child_width).height();
 }
 
+void BoxLayout::OnChildPreferredSizeChanged(View* host, View* child) {
+  HostPreferredSizeShouldChange(host);
+}
+
 gfx::Size BoxLayout::GetPreferredSizeForChildWidth(View* host,
                                                    int child_area_width) {
   gfx::Rect child_area_bounds;
 
   if (orientation_ == kHorizontal) {
     // Horizontal layouts ignore |child_area_width|, meaning they mimic the
     // default behavior of GridLayout::GetPreferredHeightForWidth().
     // TODO(estade): fix this if it ever becomes a problem.
     int position = 0;
     for (int i = 0; i < host->child_count(); ++i) {
@@ skipping 27 matching lines @@
                    child_area_bounds.height() + non_child_size.height());
 }
 
 gfx::Size BoxLayout::NonChildSize(View* host) {
   gfx::Insets insets(host->GetInsets());
   return gfx::Size(insets.width() + inside_border_insets_.width(),
                    insets.height() + inside_border_insets_.height());
 }
 
 } // namespace views