Reapply r50859 with chromeos fixes.

app/menus/button_menu_item_model.h

Index: app/menus/button_menu_item_model.h
diff --git a/app/menus/button_menu_item_model.h b/app/menus/button_menu_item_model.h
new file mode 100644
index 0000000000000000000000000000000000000000..b8418d18e433ed28d4c9d39c669d6c4e735c06df
--- /dev/null
+++ b/app/menus/button_menu_item_model.h
@@ -0,0 +1,103 @@
+// Copyright (c) 2010 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 APP_MENUS_BUTTON_MENU_ITEM_MODEL_H_
+#define APP_MENUS_BUTTON_MENU_ITEM_MODEL_H_
+
+#include <vector>
+
+#include "base/string16.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace menus {
+
+// A model representing the rows of buttons that should be inserted in a button
+// containing menu item.
+//
+// TODO(erg): There are still two major pieces missing from this model. It
+// needs to be able to group buttons together so they all have the same
+// width. ButtonSides needs to be used to communicate how buttons are squashed
+// together.
+class ButtonMenuItemModel {
+ public:
+  // Types of buttons.
+  enum ButtonType {
+    TYPE_SPACE,
+    TYPE_BUTTON
+  };
+
+  // Which sides of the button are visible.
+  enum ButtonSides {
+    SIDE_NONE = 0,
+    SIDE_LEFT = 1 << 0,
+    SIDE_RIGHT = 1 << 1,
+    SIDE_BOTH = SIDE_LEFT | SIDE_RIGHT
+  };
+
+  class Delegate {
+   public:
+    // Some command ids have labels that change over time.
+    virtual bool IsLabelForCommandIdDynamic(int command_id) const {
+      return false;
+    }
+    virtual string16 GetLabelForCommandId(int command_id) const {
+      return string16();
+    }
+
+    // Performs the action associated with the specified command id.
+    virtual void ExecuteCommand(int command_id) = 0;
+  };
+
+  ButtonMenuItemModel(int string_id, ButtonMenuItemModel::Delegate* delegate);
+
+  // Adds a button that will emit |command_id|.
+  void AddItemWithStringId(int command_id, int string_id);
+
+  // Adds a button that has an icon instead of a label.
+  void AddItemWithImage(int command_id, int icon_idr);
+
+  // Adds a small horizontal space.
+  void AddSpace();
+
+  // Returns the number of items for iteration.
+  int GetItemCount() const;
+
+  // Returns what kind of item is at |index|.
+  ButtonType GetTypeAt(int index) const;
+
+  // Changes a position into a command ID.
+  int GetCommandIdAt(int index) const;
+
+  const string16& GetLabelAt(int index) const;
+
+  // If the button at |index| should have an icon instead, returns true and
+  // sets the IDR |icon|.
+  bool GetIconAt(int index, int* icon) const;
+
+  // Called from implementations.
+  void ActivatedCommand(int command_id);
+
+  const string16& label() const { return item_label_; }
+
+ private:
+  // The non-clickable label to the left of the buttons.
+  string16 item_label_;
+
+  struct Item {
+    int command_id;
+    ButtonType type;
+    string16 label;
+    int sides;
+    int icon_idr;
+  };
+  std::vector<Item> items_;
+
+  Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(ButtonMenuItemModel);
+};
+
+}  // namespace menus
+
+#endif  // APP_MENUS_BUTTON_MENU_ITEM_MODEL_H_