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

ash/shell/lock_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.
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell_window_ids.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/window.h"
@@ skipping 17 matching lines @@
  public:
   LockView() : unlock_button_(new views::LabelButton(
                                   this, base::ASCIIToUTF16("Unlock"))) {
     unlock_button_->SetStyle(views::Button::STYLE_BUTTON);
     AddChildView(unlock_button_);
     unlock_button_->SetFocusable(true);
   }
   virtual ~LockView() {}
 
   // Overridden from views::View:
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(500, 400);
   }
 
  private:
   // Overridden from views::View:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     canvas->FillRect(GetLocalBounds(), SK_ColorYELLOW);
     base::string16 text = base::ASCIIToUTF16("LOCKED!");
     int string_width = gfx::GetStringWidth(text, font_list_);
     canvas->DrawStringRect(text, font_list_, SK_ColorRED,
@@ skipping 53 matching lines @@
   widget->GetNativeView()->SetName("LockView");
   widget->GetNativeView()->Focus();
 
   // TODO: it shouldn't be necessary to invoke UpdateTooltip() here.
   Shell::GetInstance()->tooltip_controller()->UpdateTooltip(
       widget->GetNativeView());
 }
 
 }  // namespace shell
 }  // namespace ash