Implement app list folder management page UI.

ui/app_list/views/folder_header_view.h

Index: ui/app_list/views/folder_header_view.h
diff --git a/ui/app_list/views/folder_header_view.h b/ui/app_list/views/folder_header_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..3b2780d0ed9079be992cc8a04f1c82c14a3355c5
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+++ b/ui/app_list/views/folder_header_view.h
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+// Copyright (c) 2013 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_APP_LIST_VIEWS_FOLDER_HEADER_VIEW_H_
+#define UI_APP_LIST_VIEWS_FOLDER_HEADER_VIEW_H_
+
+#include <string>
+
+#include "ui/app_list/app_list_item_model_observer.h"
+#include "ui/views/controls/textfield/textfield_controller.h"
+#include "ui/views/view.h"
+
+namespace views {
+class ImageButton;
+}  // namespace views
+
+namespace app_list {
+
+class AppListFolderItem;
+class AppListFolderView;
+
+// FolderHeaderView contains a back button and an editable folder name field.
+class FolderHeaderView : public views::View,
+                         public views::TextfieldController,
+                         public AppListItemModelObserver {
+ public:
+  FolderHeaderView(AppListFolderView* folder_view);
+  virtual ~FolderHeaderView();
+
+  void SetFolderItem(AppListFolderItem* folder_item);
+
+  // Overridden from views::View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+
+ private:
+  class FolderNameView;
+
+  // Updates UI.
+  void Update();
+
+  // Overriden from views::View:
+  virtual void Layout() OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+
+  // Overridden from views::TextfieldController:
+  virtual void ContentsChanged(views::Textfield* sender,
+                               const base::string16& new_contents) OVERRIDE;
+
+  // Overridden from AppListItemModelObserver:
+  virtual void ItemIconChanged() OVERRIDE;
+  virtual void ItemTitleChanged() OVERRIDE;
+  virtual void ItemHighlightedChanged() OVERRIDE;
+  virtual void ItemIsInstallingChanged() OVERRIDE;
+  virtual void ItemPercentDownloadedChanged() OVERRIDE;
+
+  AppListFolderItem* folder_item_;  // Not owned.
+
+  views::ImageButton* back_button_;  // Owned by views hierarchy.
+  FolderNameView* folder_name_view_;  // Owned by views hierarchy.
+
+  DISALLOW_COPY_AND_ASSIGN(FolderHeaderView);
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_VIEWS_FOLDER_HEADER_VIEW_H_