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

ash/system/user/rounded_image_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/user/rounded_image_view.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image_skia_operations.h"
@@ skipping 27 matching lines @@
 void RoundedImageView::SetCornerRadii(int top_left,
                                       int top_right,
                                       int bottom_right,
                                       int bottom_left) {
   corner_radius_[0] = top_left;
   corner_radius_[1] = top_right;
   corner_radius_[2] = bottom_right;
   corner_radius_[3] = bottom_left;
 }
 
-gfx::Size RoundedImageView::GetPreferredSize() {
+gfx::Size RoundedImageView::GetPreferredSize() const {
   return gfx::Size(image_size_.width() + GetInsets().width(),
                    image_size_.height() + GetInsets().height());
 }
 
 void RoundedImageView::OnPaint(gfx::Canvas* canvas) {
   View::OnPaint(canvas);
   gfx::Rect image_bounds(size());
   image_bounds.ClampToCenteredSize(GetPreferredSize());
   image_bounds.Inset(GetInsets());
   const SkScalar kRadius[8] = {
@@ skipping 11 matching lines @@
   SkPaint paint;
   paint.setAntiAlias(true);
   paint.setXfermodeMode(active_user_ ? SkXfermode::kSrcOver_Mode
                                      : SkXfermode::kLuminosity_Mode);
   canvas->DrawImageInPath(
       resized_, image_bounds.x(), image_bounds.y(), path, paint);
 }
 
 }  // namespace tray
 }  // namespace ash