ash: First pass of Applist v2.

ash/app_list/pagination_model_observer.h

Index: ash/app_list/pagination_model_observer.h
diff --git a/ash/app_list/pagination_model_observer.h b/ash/app_list/pagination_model_observer.h
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+// Copyright (c) 2012 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_APP_LIST_PAGINATION_MODEL_OBSERVER_H_
+#define ASH_APP_LIST_PAGINATION_MODEL_OBSERVER_H_
+#pragma once
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+class ASH_EXPORT PaginationModelObserver {
+ public:
+  // Invoked when the total number of page is changed.
+  virtual void TotalPagesChanged() = 0;
+
+  // Invoked when the selected page index is changed.
+  virtual void SelectedPageChanged(int old_selected, int new_selected) = 0;
+
+ protected:
+  virtual ~PaginationModelObserver() {}
+};
+
+}  // namespace ash
+
+#endif  // ASH_APP_LIST_PAGINATION_MODEL_OBSERVER_H_