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

chrome/browser/ui/views/tabs/tab_strip.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 "chrome/browser/ui/views/tabs/tab_strip.h"
 
 #if defined(OS_WIN)
 #include <windowsx.h>
 #endif
 
@@ skipping 1235 matching lines @@
 
   // If the active tab is being dragged, it goes last.
   if (active_tab && is_dragging)
     active_tab->Paint(canvas, cull_set);
 }
 
 const char* TabStrip::GetClassName() const {
   return kViewClassName;
 }
 
-gfx::Size TabStrip::GetPreferredSize() {
+gfx::Size TabStrip::GetPreferredSize() const {
   // For stacked tabs the minimum size is calculated as the size needed to
   // handle showing any number of tabs. Otherwise report the minimum width as
   // the size required for a single selected tab plus the new tab button. Don't
   // base it on the actual number of tabs because it's undesirable to have the
   // minimum window size change when a new tab is opened.
   int needed_width;
   if (touch_layout_.get() || adjust_layout_) {
     needed_width = Tab::GetTouchWidth() +
         (2 * kStackedPadding * kMaxStackedCount);
   } else {
@@ skipping 1379 matching lines @@
   else
     RemoveMessageLoopObserver();
 }
 
 bool TabStrip::GetAdjustLayout() const {
   if (!adjust_layout_)
     return false;
   return chrome::GetHostDesktopTypeForNativeView(
       GetWidget()->GetNativeView()) == chrome::HOST_DESKTOP_TYPE_ASH;
 }