Experimental app list: "All apps" button has a folder-like icon.

ui/app_list/views/all_apps_tile_item_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 "ui/app_list/views/all_apps_tile_item_view.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_item_list.h"
 #include "ui/app_list/folder_image_source.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/strings/grit/ui_strings.h"
 
 namespace app_list {
 
-AllAppsTileItemView::AllAppsTileItemView(ContentsView* contents_view)
-    : contents_view_(contents_view) {
+AllAppsTileItemView::AllAppsTileItemView(ContentsView* contents_view,
+                                         AppListItemList* item_list)
+    : contents_view_(contents_view), folder_image_(item_list) {
   SetTitle(l10n_util::GetStringUTF16(IDS_APP_LIST_ALL_APPS));
-  // TODO(mgiuca): Set the button's icon.
+  folder_image_.AddObserver(this);
 }
 
 AllAppsTileItemView::~AllAppsTileItemView() {
+  folder_image_.RemoveObserver(this);
+}
+
+void AllAppsTileItemView::UpdateIcon() {
+  folder_image_.UpdateIcon();

[calamity, 2014/10/28 05:12:58]

It would be nice not to need this. If FolderImage's constructor drew the image,
then the you could just add SetIcon(folder_image_.image()) to this class'
constructor.

[Matt Giuca, 2014/10/29 07:11:23]

Yeah would be nice...

http://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Doing_Work_in...

 }
 
 void AllAppsTileItemView::ButtonPressed(views::Button* sender,
                                         const ui::Event& event) {
   contents_view_->SetActivePage(
       contents_view_->GetPageIndexForNamedPage(ContentsView::NAMED_PAGE_APPS));
 }
 
+void AllAppsTileItemView::OnFolderImageUpdated(const gfx::ImageSkia& icon) {
+  SetIcon(icon);
+}
+
 }  // namespace app_list