Refactor app_list_util.h into AppListService abstract base.

chrome/browser/ui/ash/app_list/app_list_controller_ash.h

Index: chrome/browser/ui/ash/app_list/app_list_controller_ash.h
diff --git a/chrome/browser/ui/ash/app_list/app_list_controller_ash.h b/chrome/browser/ui/ash/app_list/app_list_controller_ash.h
index b8a50f5f4efd6ba831e4071ad688812ee7ccf237..13c778f6b4089b9f7be3c8779f70efcb48823ef6 100644
--- a/chrome/browser/ui/ash/app_list/app_list_controller_ash.h
+++ b/chrome/browser/ui/ash/app_list/app_list_controller_ash.h
@@ -8,6 +8,9 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/app_list/app_list_controller_delegate.h"
+#include "chrome/browser/ui/app_list_service.h"
+
+template <typename T> struct DefaultSingletonTraits;
 
 class AppListControllerDelegateAsh : public AppListControllerDelegate {
  public:
@@ -34,4 +37,21 @@ class AppListControllerDelegateAsh : public AppListControllerDelegate {
   DISALLOW_COPY_AND_ASSIGN(AppListControllerDelegateAsh);
 };
 
+class AppListServiceAsh : public AppListService {
+ public:
+  static AppListServiceAsh* GetInstance();
+
+  // AppListService overrides:
+  virtual void ShowAppList(Profile* default_profile) OVERRIDE;
+  virtual bool IsAppListVisible() OVERRIDE;
+  virtual void DismissAppList() OVERRIDE;
+
+ private:
+  AppListServiceAsh() {}
+
+  friend struct DefaultSingletonTraits<AppListServiceAsh>;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListServiceAsh);
+};
+
 #endif  // CHROME_BROWSER_UI_ASH_APP_LIST_APP_LIST_CONTROLLER_ASH_H_