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

ash/system/audio/volume_view.cc

 // Copyright 2014 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/system/audio/volume_view.h"
 
 #include "ash/ash_constants.h"
 #include "ash/shell.h"
 #include "ash/system/audio/tray_audio.h"
 #include "ash/system/audio/tray_audio_delegate.h"
@@ skipping 55 matching lines @@
       gfx::ImageSkia image_skia = gfx::ImageSkiaOperations::ExtractSubset(
           *(image_.ToImageSkia()), region);
       SetImage(views::CustomButton::STATE_NORMAL, &image_skia);
       image_index_ = image_index;
     }
     SchedulePaint();
   }
 
  private:
   // Overridden from views::View.
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     gfx::Size size = views::ToggleImageButton::GetPreferredSize();
     size.set_height(kTrayPopupItemHeight);
     return size;
   }
 
   system::TrayAudioDelegate* audio_delegate_;
   gfx::Image image_;
   int image_index_;
 
   DISALLOW_COPY_AND_ASSIGN(VolumeButton);
@@ skipping 25 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(VolumeSlider);
 };
 
 // Vertical bar separator that can be placed on the VolumeView.
 class BarSeparator : public views::View {
  public:
   BarSeparator() {}
   virtual ~BarSeparator() {}
 
   // Overriden from views::View.
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(kBarSeparatorWidth, kBarSeparatorHeight);
   }
 
  private:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     canvas->FillRect(gfx::Rect(width() / 2, 0, 1, height()),
                      kButtonStrokeColor);
   }
 
   DISALLOW_COPY_AND_ASSIGN(BarSeparator);
@@ skipping 188 matching lines @@
 
 bool VolumeView::PerformAction(const ui::Event& event) {
   if (!more_->visible())
     return false;
   owner_->TransitionDetailedView();
   return true;
 }
 
 }  // namespace tray
 }  // namespace ash