Couple of tweaks for tables:

ui/views/examples/table_example.h

 // 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 UI_VIEWS_EXAMPLES_TABLE_EXAMPLE_H_
 #define UI_VIEWS_EXAMPLES_TABLE_EXAMPLE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/models/table_model.h"
 #include "ui/views/controls/button/button.h"
+#include "ui/views/controls/table/table_grouper.h"
 #include "ui/views/controls/table/table_view.h"
 #include "ui/views/controls/table/table_view_observer.h"
 #include "ui/views/examples/example_base.h"
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace views {
 class Checkbox;
 class Event;
 class TableView;
 
 namespace examples {
 
-class TableExample : public ExampleBase,
-                     public ui::TableModel,
-                     public TableViewObserver,
-                     public ButtonListener {
+class TableExample
+    : public ExampleBase,
+      public ui::TableModel,
+      public views::TableGrouper,

[tfarina, 2013/01/08 23:01:24]

nit: you shouldn't need views:: here, as TableExample is under views::examples
namespace.

+      public TableViewObserver,
+      public ButtonListener {
  public:
   TableExample();
   virtual ~TableExample();
 
   // ExampleBase:
   virtual void CreateExampleView(View* container) OVERRIDE;
 
   // ui::TableModel:
   virtual int RowCount() OVERRIDE;
   virtual string16 GetText(int row, int column_id) OVERRIDE;
   virtual gfx::ImageSkia GetIcon(int row) OVERRIDE;
   virtual void SetObserver(ui::TableModelObserver* observer) OVERRIDE;
 
+  // views::TableGrouper:
+  virtual void GetGroupRange(int model_index, GroupRange* range) OVERRIDE;
+
   // TableViewObserver:
   virtual void OnSelectionChanged() OVERRIDE;
   virtual void OnDoubleClick() OVERRIDE;
   virtual void OnMiddleClick() OVERRIDE;
   virtual void OnKeyDown(ui::KeyboardCode virtual_keycode) OVERRIDE;
 
   // ButtonListener:
   virtual void ButtonPressed(Button* sender, const ui::Event& event) OVERRIDE;
 
  private:
   // The table to be tested.
   TableView* table_;
 
   Checkbox* column1_visible_checkbox_;
   Checkbox* column2_visible_checkbox_;
   Checkbox* column3_visible_checkbox_;
   Checkbox* column4_visible_checkbox_;
 
   SkBitmap icon1_;
   SkBitmap icon2_;
 
   DISALLOW_COPY_AND_ASSIGN(TableExample);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_TABLE_EXAMPLE_H_