MacViews: Implement Full Keyboard Access.

ui/views/controls/button/button.h

 // Copyright (c) 2011 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_CONTROLS_BUTTON_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_BUTTON_H_
 
 #include "base/macros.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/animation/ink_drop_host_view.h"
@@ skipping 31 matching lines @@
   // Button styles with associated images and border painters.
   // TODO(msw): Add Menu, ComboBox, etc.
   enum ButtonStyle {
     STYLE_BUTTON = 0,
     STYLE_TEXTBUTTON,
     STYLE_COUNT,
   };
 
   static ButtonState GetButtonStateFrom(ui::NativeTheme::State state);
 
+  // Make the |button| focusable as per the platform.
+  static void ConfigureDefaultFocus(Button* button);
+
   void SetTooltipText(const base::string16& tooltip_text);
 
   int tag() const { return tag_; }
   void set_tag(int tag) { tag_ = tag; }
 
   void SetAccessibleName(const base::string16& name);
 
   // Overridden from View:
   bool GetTooltipText(const gfx::Point& p,
                       base::string16* tooltip) const override;
@@ skipping 26 matching lines @@
   // The id tag associated with this button. Used to disambiguate buttons in
   // the ButtonListener implementation.
   int tag_;
 
   DISALLOW_COPY_AND_ASSIGN(Button);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_BUTTON_H_