Add a whole-app-list unit test.

ui/app_list/views/app_list_view.cc

Index: ui/app_list/views/app_list_view.cc
diff --git a/ui/app_list/views/app_list_view.cc b/ui/app_list/views/app_list_view.cc
index 0c5c5f705315148f3f60a75e5daf9dd48bb70075..a7f607da5e433d6c42f89ad864613cc947c1310c 100644
--- a/ui/app_list/views/app_list_view.cc
+++ b/ui/app_list/views/app_list_view.cc
@@ -53,8 +53,6 @@ namespace app_list {
 
 namespace {
 
-void (*g_next_paint_callback)();
-
 // The margin from the edge to the speech UI.
 const int kSpeechUIMargin = 12;
 
@@ -206,9 +204,9 @@ gfx::Size AppListView::GetPreferredSize() {
 
 void AppListView::Paint(gfx::Canvas* canvas, const views::CullSet& cull_set) {
   views::BubbleDelegateView::Paint(canvas, cull_set);
-  if (g_next_paint_callback) {
-    g_next_paint_callback();
-    g_next_paint_callback = NULL;
+  if (!next_paint_callback_.is_null()) {
+    next_paint_callback_.Run();
+    next_paint_callback_.Reset();
   }
 }
 
@@ -250,8 +248,8 @@ void AppListView::RemoveObserver(AppListViewObserver* observer) {
 }
 
 // static
-void AppListView::SetNextPaintCallback(void (*callback)()) {
-  g_next_paint_callback = callback;
+void AppListView::SetNextPaintCallback(const base::Closure& callback) {
+  next_paint_callback_ = callback;
 }
 
 #if defined(OS_WIN)