Add a unit test for resetting the app list on a reshow.

ui/app_list/test/app_list_test_model.cc

 // Copyright 2013 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/test/app_list_test_model.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
+#include "ui/gfx/image/image_skia.h"
 
 namespace app_list {
 namespace test {
 
 // static
 const char AppListTestModel::kItemType[] = "TestItem";
 
 // AppListTestModel::AppListTestItem
 
 AppListTestModel::AppListTestItem::AppListTestItem(
     const std::string& id,
     AppListTestModel* model)
     : AppListItem(id),
       model_(model) {
+  SkBitmap bitmap;

[tapted, 2014/04/01 06:28:27]

In my demo code I'm doing

  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  SetIcon(*rb.GetImageNamed(IDR_DEFAULT_FAVICON_32).ToImageSkia());

it might even be less work because the bitmap is shared, and I think skia is
smart enough to only resize it once. WDYT?

Oddly there were exactly zero icons in ui_resources.grd with dimensions 48x48.

[calamity, 2014/04/01 08:08:46]

Done.

+  const int kBitmapSize = 48;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config, kBitmapSize, kBitmapSize);
+  SetIcon(gfx::ImageSkia::CreateFrom1xBitmap(bitmap), false);
 }
+
 AppListTestModel::AppListTestItem::~AppListTestItem() {
 }
 
 void AppListTestModel::AppListTestItem::Activate(int event_flags) {
   model_->ItemActivated(this);
 }
 
 const char* AppListTestModel::AppListTestItem::GetItemType() const {
   return AppListTestModel::kItemType;
 }
@@ skipping 13 matching lines @@
 AppListItem* AppListTestModel::AddItem(AppListItem* item) {
   return AppListModel::AddItem(make_scoped_ptr(item));
 }
 
 AppListItem* AppListTestModel::AddItemToFolder(AppListItem* item,
                                                const std::string& folder_id) {
   return AppListModel::AddItemToFolder(make_scoped_ptr(item), folder_id);
 }
 
 void AppListTestModel::MoveItemToFolder(AppListItem* item,
-                                          const std::string& folder_id) {
+                                        const std::string& folder_id) {
   AppListModel::MoveItemToFolder(item, folder_id);
 }
 
 
 std::string AppListTestModel::GetItemName(int id) {
   return base::StringPrintf("Item %d", id);
 }
 
 void AppListTestModel::PopulateApps(int n) {
   int start_index = static_cast<int>(top_level_item_list()->item_count());
@@ skipping 63 matching lines @@
   item->SetHighlighted(true);
 }
 
 void AppListTestModel::ItemActivated(AppListTestItem* item) {
   last_activated_ = item;
   ++activate_count_;
 }
 
 }  // namespace test
 }  // namespace app_list