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

ui/views/examples/multiline_example.cc

 // Copyright 2013 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/multiline_example.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/events/event.h"
 #include "ui/gfx/render_text.h"
 #include "ui/views/background.h"
@@ skipping 17 matching lines @@
     render_text_->SetColor(SK_ColorBLACK);
     render_text_->SetMultiline(true);
     SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY));
   }
 
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     View::OnPaint(canvas);
     render_text_->Draw(canvas);
   }
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     // Turn off multiline mode to get the single-line text size, which is the
     // preferred size for this view.
     render_text_->SetMultiline(false);
     gfx::Size size(render_text_->GetContentWidth(),
                    render_text_->GetStringSize().height());
     size.Enlarge(GetInsets().width(), GetInsets().height());
     render_text_->SetMultiline(true);
     return size;
   }
 
-  virtual int GetHeightForWidth(int w) OVERRIDE {
+  virtual int GetHeightForWidth(int w) const OVERRIDE {
     // TODO(ckocagil): Why does this happen?
     if (w == 0)
       return View::GetHeightForWidth(w);
     const gfx::Rect old_rect = render_text_->display_rect();
     gfx::Rect rect = old_rect;
     rect.set_width(w - GetInsets().width());
     render_text_->SetDisplayRect(rect);
     int height = render_text_->GetStringSize().height() + GetInsets().height();
     render_text_->SetDisplayRect(old_rect);
     return height;
@@ skipping 98 matching lines @@
 void MultilineExample::ButtonPressed(Button* sender, const ui::Event& event) {
   DCHECK_EQ(sender, label_checkbox_);
   label_->SetText(label_checkbox_->checked() ? textfield_->text() :
                                                base::string16());
   container()->Layout();
   container()->SchedulePaint();
 }
 
 }  // namespace examples
 }  // namespace views