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

ash/ime/mode_indicator_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/ime/mode_indicator_view.h"
 
 #include "base/logging.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/bubble/bubble_delegate.h"
@@ skipping 50 matching lines @@
   wm::SetWindowVisibilityAnimationTransition(
       GetWidget()->GetNativeView(),
       wm::ANIMATE_HIDE);
   GetWidget()->Show();
   timer_.Start(FROM_HERE,
                base::TimeDelta::FromMilliseconds(kShowingDuration),
                GetWidget(),
                &views::Widget::Close);
 }
 
-gfx::Size ModeIndicatorView::GetPreferredSize() {
+gfx::Size ModeIndicatorView::GetPreferredSize() const {
   gfx::Size size = label_view_->GetPreferredSize();
   size.SetToMax(gfx::Size(kMinSize, kMinSize));
   return size;
 }
 
 void ModeIndicatorView::Init() {
   SetLayoutManager(new views::FillLayout());
   AddChildView(label_view_);
 
   SetAnchorRect(cursor_bounds_);
 }
 
 views::NonClientFrameView* ModeIndicatorView::CreateNonClientFrameView(
     views::Widget* widget) {
   views::BubbleFrameView* frame = new ModeIndicatorFrameView(margins());
   // arrow adjustment in BubbleDelegateView is unnecessary because arrow
   // of this bubble is always center.
   frame->SetBubbleBorder(scoped_ptr<views::BubbleBorder>(
       new views::BubbleBorder(arrow(), shadow(), color())));
   return frame;
 }
 
 }  // namespace ime
 }  // namespace ash