[Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_item_view_listener.h

Index: ui/aura_shell/app_list/app_list_item_view_listener.h
diff --git a/ui/aura_shell/app_list/app_list_item_view_listener.h b/ui/aura_shell/app_list/app_list_item_view_listener.h
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index 0000000000000000000000000000000000000000..dfa2084f2c63131d2a695decc82fa28a1e212122
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+++ b/ui/aura_shell/app_list/app_list_item_view_listener.h
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+// Copyright (c) 2011 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 UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_VIEW_LISTENER_H_
+#define UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_VIEW_LISTENER_H_
+#pragma once
+
+#include "ui/aura_shell/aura_shell_export.h"
+
+namespace aura_shell {
+
+class AppListItemView;
+
+class AURA_SHELL_EXPORT AppListItemViewListener {
+ public:
+  // Invoked when an AppListeItemModelView is activated by click or enter key.
+  virtual void AppListItemActivated(AppListItemView* sender,
+                                    int event_flags) = 0;
+
+ protected:
+  virtual ~AppListItemViewListener() {}
+};
+
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_VIEW_LISTENER_H_