Add views::View::set_preferred_size, use it in a few places.

ui/views/view.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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 404 matching lines @@
   return gfx::ToEnclosingRect(views_vis_bounds);
 }
 
 gfx::Rect View::GetBoundsInScreen() const {
   gfx::Point origin;
   View::ConvertPointToScreen(this, &origin);
   return gfx::Rect(origin, size());
 }
 
 gfx::Size View::GetPreferredSize() const {
+  if (preferred_size_)
+    return *preferred_size_;
   if (layout_manager_.get())
     return layout_manager_->GetPreferredSize(this);
-  return gfx::Size();
+  return CalculatePreferredSize();
 }
 
 int View::GetBaseline() const {
   return -1;
 }
 
 void View::SizeToPreferredSize() {
   gfx::Size prefsize = GetPreferredSize();
   if ((prefsize.width() != width()) || (prefsize.height() != height()))
     SetBounds(x(), y(), prefsize.width(), prefsize.height());
@@ skipping 1032 matching lines @@
 
 bool View::HasObserver(const ViewObserver* observer) const {
   return observers_.HasObserver(observer);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // View, protected:
 
 // Size and disposition --------------------------------------------------------
 
+gfx::Size View::CalculatePreferredSize() const {
+  return gfx::Size();
+}
+
 void View::OnBoundsChanged(const gfx::Rect& previous_bounds) {
 }
 
 void View::PreferredSizeChanged() {
   InvalidateLayout();
   if (parent_)
     parent_->ChildPreferredSizeChanged(this);
 }
 
 bool View::GetNeedsNotificationWhenVisibleBoundsChange() const {
@@ skipping 1174 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views