Reland of AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation.

ash/app_list/app_list_view_delegate_factory.h

Index: ash/app_list/app_list_view_delegate_factory.h
diff --git a/ash/app_list/app_list_view_delegate_factory.h b/ash/app_list/app_list_view_delegate_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..4de11b4671ec14fc3b531bfc529007212321eb8d
--- /dev/null
+++ b/ash/app_list/app_list_view_delegate_factory.h
@@ -0,0 +1,25 @@
+// Copyright 2016 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.
+
+#ifndef ASH_WM_APP_LIST_VIEW_DELEGATE_FACTORY_H_
+#define ASH_WM_APP_LIST_VIEW_DELEGATE_FACTORY_H_
+
+#include "ash/ash_export.h"
+
+namespace app_list {
+class AppListViewDelegate;
+}
+
+namespace ash {
+
+class ASH_EXPORT AppListViewDelegateFactory {
+ public:
+  virtual ~AppListViewDelegateFactory() {}
+
+  virtual app_list::AppListViewDelegate* GetDelegate() = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_APP_LIST_VIEW_DELEGATE_FACTORY_H_