Refactor LauncherItemController and LauncherItemDelegate

ash/shell/window_watcher.cc

Index: ash/shell/window_watcher.cc
diff --git a/ash/shell/window_watcher.cc b/ash/shell/window_watcher.cc
index 4dfcea4e57746993c3b900acb0fd50d8a039c4e8..ffe955c3fce571ba6bd05436ec39fffdbc995505 100644
--- a/ash/shell/window_watcher.cc
+++ b/ash/shell/window_watcher.cc
@@ -6,9 +6,11 @@
 
 #include "ash/display/display_controller.h"
 #include "ash/launcher/launcher.h"
+#include "ash/launcher/launcher_item_delegate_manager.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
+#include "ash/shell/launcher_item_delegate_impl.h"
 #include "ash/shell_window_ids.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -108,7 +110,8 @@ void WindowWatcher::OnWindowAdded(aura::Window* new_window) {
   ash::LauncherItem item;
   item.type = new_window->type() == aura::client::WINDOW_TYPE_PANEL ?
       ash::TYPE_APP_PANEL : ash::TYPE_PLATFORM_APP;
-  id_to_window_[model->next_id()] = new_window;
+  ash::LauncherID id = model->next_id();
+  id_to_window_[id] = new_window;
 
   SkBitmap icon_bitmap;
   icon_bitmap.setConfig(SkBitmap::kARGB_8888_Config, 16, 16);
@@ -122,6 +125,12 @@ void WindowWatcher::OnWindowAdded(aura::Window* new_window) {
                                                 ui::SCALE_FACTOR_100P));
 
   model->Add(item);
+
+  ash::LauncherItemDelegateManager* manager =
+      ash::Shell::GetInstance()->launcher_item_delegate_manager();
+  manager->RegisterLauncherItemDelegate(
+      id,
+      new LauncherItemDelegateImpl(id, this));
 }
 
 void WindowWatcher::OnWillRemoveWindow(aura::Window* window) {