FolderImage: Const correctness.

ui/app_list/folder_image.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 "ui/app_list/folder_image.h"
 
 #include <vector>
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item.h"
@@ skipping 114 matching lines @@
 
   for (size_t i = 0; i < kNumFolderTopItems && i < item_list_->item_count();
        ++i) {
     AppListItem* item = item_list_->item_at(i);
     item->AddObserver(this);
     top_items_.push_back(item);
   }
   RedrawIconAndNotify();
 }
 
-const gfx::ImageSkia& FolderImage::GetTopIcon(size_t item_index) {
+const gfx::ImageSkia& FolderImage::GetTopIcon(size_t item_index) const {
   CHECK_LT(item_index, top_items_.size());
   return top_items_[item_index]->icon();
 }
 
 // static
 std::vector<gfx::Rect> FolderImage::GetTopIconsBounds(
     const gfx::Rect& folder_icon_bounds) {
   const int delta_to_center = 1;
   gfx::Point icon_center = folder_icon_bounds.CenterPoint();
   std::vector<gfx::Rect> top_icon_bounds;
@@ skipping 18 matching lines @@
   // Get the bottom right icon bounds.
   gfx::Rect bottom_right(right_x, bottom_y, kItemIconDimension,
                          kItemIconDimension);
   top_icon_bounds.push_back(bottom_right);
 
   return top_icon_bounds;
 }
 
 gfx::Rect FolderImage::GetTargetIconRectInFolderForItem(
     AppListItem* item,
-    const gfx::Rect& folder_icon_bounds) {
+    const gfx::Rect& folder_icon_bounds) const {
   for (size_t i = 0; i < top_items_.size(); ++i) {
     if (item->id() == top_items_[i]->id()) {
       std::vector<gfx::Rect> rects = GetTopIconsBounds(folder_icon_bounds);
       return rects[i];
     }
   }
 
   gfx::Rect target_rect(folder_icon_bounds);
   target_rect.ClampToCenteredSize(ItemIconSize());
   return target_rect;
@@ skipping 38 matching lines @@
     top_icons.push_back(item->icon());
 
   const gfx::Size icon_size = gfx::Size(kGridIconDimension, kGridIconDimension);
   icon_ =
       gfx::ImageSkia(new FolderImageSource(top_icons, icon_size), icon_size);
 
   FOR_EACH_OBSERVER(FolderImageObserver, observers_, OnFolderImageUpdated());
 }
 
 }  // namespace app_list