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

ash/wm/workspace/multi_window_resize_controller.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/wm/workspace/multi_window_resize_controller.h"
 
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/coordinate_conversion.h"
@@ skipping 53 matching lines @@
         direction_(direction),
         image_(NULL) {
     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     int image_id =
         direction == TOP_BOTTOM ? IDR_AURA_MULTI_WINDOW_RESIZE_H :
                                   IDR_AURA_MULTI_WINDOW_RESIZE_V;
     image_ = rb.GetImageNamed(image_id).ToImageSkia();
   }
 
   // views::View overrides:
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(image_->width(), image_->height());
   }
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     canvas->DrawImageInt(*image_, 0, 0);
   }
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE {
     gfx::Point location(event.location());
     views::View::ConvertPointToScreen(this, &location);
     controller_->StartResize(location);
     return true;
@@ skipping 448 matching lines @@
     return false;
 
   gfx::Point window_loc(location_in_screen);
   aura::Window::ConvertPointToTarget(
       window->GetRootWindow(), window, &window_loc);
   return window->ContainsPoint(window_loc) &&
       window->delegate()->GetNonClientComponent(window_loc) == component;
 }
 
 }  // namespace ash