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

ui/views/controls/slider.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/slider.h"
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 166 matching lines @@
 
   if (!focus_border_color_) {
     canvas->DrawFocusRect(GetLocalBounds());
   } else if (HasFocus()) {
     canvas->DrawSolidFocusRect(
         gfx::Rect(1, 1, width() - 3, height() - 3),
         focus_border_color_);
   }
 }
 
-gfx::Size Slider::GetPreferredSize() {
+gfx::Size Slider::GetPreferredSize() const {
   const int kSizeMajor = 200;
   const int kSizeMinor = 40;
 
   if (orientation_ == HORIZONTAL)
     return gfx::Size(std::max(width(), kSizeMajor), kSizeMinor);
   return gfx::Size(kSizeMinor, std::max(height(), kSizeMajor));
 }
 
 void Slider::OnPaint(gfx::Canvas* canvas) {
   gfx::Rect content = GetContentsBounds();
@@ skipping 136 matching lines @@
 }
 
 void Slider::GetAccessibleState(ui::AXViewState* state) {
   state->role = ui::AX_ROLE_SLIDER;
   state->name = accessible_name_;
   state->value = base::UTF8ToUTF16(
       base::StringPrintf("%d%%", (int)(value_ * 100 + 0.5)));
 }
 
 }  // namespace views