views: Make view::Views::GetPreferredSize() const.

ui/views/examples/single_split_view_example.cc

 // 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.
 
 #include "ui/views/examples/single_split_view_example.h"
 
 #include "ui/views/background.h"
 #include "ui/views/controls/single_split_view.h"
 #include "ui/views/layout/grid_layout.h"
 
 namespace views {
 namespace examples {
 namespace {
 
 // SingleSplitView's content, which draws gradient color on background.
 class SplittedView : public View {
  public:
   SplittedView();
   virtual ~SplittedView();
 
   void SetColor(SkColor from, SkColor to);
 
  private:
   // View:
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
-  virtual gfx::Size GetMinimumSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
+  virtual gfx::Size GetMinimumSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(SplittedView);
 };
 
 SplittedView::SplittedView() {
   SetColor(SK_ColorRED, SK_ColorGREEN);
 }
 
 SplittedView::~SplittedView() {
 }
 
 void SplittedView::SetColor(SkColor from, SkColor to) {
   set_background(Background::CreateVerticalGradientBackground(from, to));
 }
 
-gfx::Size SplittedView::GetPreferredSize() {
+gfx::Size SplittedView::GetPreferredSize() const {
   return gfx::Size(width(), height());
 }
 
-gfx::Size SplittedView::GetMinimumSize() {
+gfx::Size SplittedView::GetMinimumSize() const {
   return gfx::Size(10, 10);
 }
 
 void SplittedView::Layout() {
   SizeToPreferredSize();
 }
 
 }  // namespace
 
 SingleSplitViewExample::SingleSplitViewExample()
@@ skipping 24 matching lines @@
   layout->AddView(single_split_view_);
 }
 
 bool SingleSplitViewExample::SplitHandleMoved(SingleSplitView* sender) {
   PrintStatus("Splitter moved");
   return true;
 }
 
 }  // namespace examples
 }  // namespace views