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

ui/app_list/test/app_list_test_model.cc

Index: ui/app_list/test/app_list_test_model.cc
diff --git a/ui/app_list/test/app_list_test_model.cc b/ui/app_list/test/app_list_test_model.cc
index 66d2a6924ea83f5d173d14645dbfa928425ff185..2742780eb627916045792472e43864f02b40c76c 100644
--- a/ui/app_list/test/app_list_test_model.cc
+++ b/ui/app_list/test/app_list_test_model.cc
@@ -6,6 +6,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
+#include "ui/gfx/image/image_skia.h"
 
 namespace app_list {
 namespace test {
@@ -20,7 +21,12 @@ AppListTestModel::AppListTestItem::AppListTestItem(
     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() {
 }
 
@@ -54,7 +60,7 @@ AppListItem* AppListTestModel::AddItemToFolder(AppListItem* item,
 }
 
 void AppListTestModel::MoveItemToFolder(AppListItem* item,
-                                          const std::string& folder_id) {
+                                        const std::string& folder_id) {
   AppListModel::MoveItemToFolder(item, folder_id);
 }