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diff --git a/chromium/ash/launcher/launcher_model.h b/chromium/ash/launcher/launcher_model.h
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+++ b/chromium/ash/launcher/launcher_model.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_LAUNCHER_LAUNCHER_MODEL_H_
+#define ASH_LAUNCHER_LAUNCHER_MODEL_H_
+
+#include "ash/ash_export.h"
+#include "ash/launcher/launcher_types.h"
+#include "base/basictypes.h"
+#include "base/observer_list.h"
+
+namespace ash {
+
+class LauncherModelObserver;
+
+// Model used by LauncherView.
+class ASH_EXPORT LauncherModel {
+ public:
+  enum Status {
+    STATUS_NORMAL,
+    // A status that indicates apps are syncing/loading.
+    STATUS_LOADING,
+  };
+
+  LauncherModel();
+  ~LauncherModel();
+
+  // Adds a new item to the model. Returns the resulting index.
+  int Add(const LauncherItem& item);
+
+  // Adds the item. |index| is the requested insertion index, which may be
+  // modified to meet type-based ordering. Returns the actual insertion index.
+  int AddAt(int index, const LauncherItem& item);
+
+  // Removes the item at |index|.
+  void RemoveItemAt(int index);
+
+  // Moves the item at |index| to |target_index|. |target_index| is in terms
+  // of the model *after* the item at |index| is removed.
+  void Move(int index, int target_index);
+
+  // Resets the item at the specified index. The item maintains its existing
+  // id and type.
+  void Set(int index, const LauncherItem& item);
+
+  // Returns the index of the item by id.
+  int ItemIndexByID(LauncherID id) const;
+
+  // Returns the index of the first panel or the index where the first panel
+  // would go if there are no panels.
+  int FirstPanelIndex() const;
+
+  // Returns the id assigned to the next item added.
+  LauncherID next_id() const { return next_id_; }
+
+  // Returns a reserved id which will not be used by the |LauncherModel|.
+  LauncherID reserve_external_id() { return next_id_++; }
+
+  // Returns an iterator into items() for the item with the specified id, or
+  // items().end() if there is no item with the specified id.
+  LauncherItems::const_iterator ItemByID(LauncherID id) const;
+
+  const LauncherItems& items() const { return items_; }
+  int item_count() const { return static_cast<int>(items_.size()); }
+
+  void SetStatus(Status status);
+  Status status() const { return status_; }
+
+  void AddObserver(LauncherModelObserver* observer);
+  void RemoveObserver(LauncherModelObserver* observer);
+
+ private:
+  // Makes sure |index| is in line with the type-based order of items. If that
+  // is not the case, adjusts index by shifting it to the valid range and
+  // returns the new value.
+  int ValidateInsertionIndex(LauncherItemType type, int index) const;
+
+  // ID assigned to the next item.
+  LauncherID next_id_;
+
+  LauncherItems items_;
+  Status status_;
+  ObserverList<LauncherModelObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(LauncherModel);
+};
+
+}  // namespace ash
+
+#endif  // ASH_LAUNCHER_LAUNCHER_MODEL_H_