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

ui/views/controls/progress_bar.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 "ui/views/controls/progress_bar.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 165 matching lines @@
   DCHECK(tooltip);
   *tooltip = tooltip_text_;
   return !tooltip_text_.empty();
 }
 
 void ProgressBar::GetAccessibleState(ui::AXViewState* state) {
   state->role = ui::AX_ROLE_PROGRESS_INDICATOR;
   state->AddStateFlag(ui::AX_STATE_READ_ONLY);
 }
 
-gfx::Size ProgressBar::GetPreferredSize() {
+gfx::Size ProgressBar::GetPreferredSize() const {
   gfx::Size pref_size(100, 11);
   gfx::Insets insets = GetInsets();
   pref_size.Enlarge(insets.width(), insets.height());
   return pref_size;
 }
 
 const char* ProgressBar::GetClassName() const {
   return kViewClassName;
 }
 
@@ skipping 117 matching lines @@
     // Draw bar stroke
     StrokeRoundRect(canvas,
                     bar_left, bar_top, progress_width, bar_height,
                     kCornerRadius,
                     enabled() ? kBarBorderColor : kDisabledBarBorderColor,
                     kBorderWidth);
   }
 }
 
 }  // namespace views