Make infobar controls focusable by default.

views/controls/button/text_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 VIEWS_CONTROLS_BUTTON_TEXT_BUTTON_H_
 #define VIEWS_CONTROLS_BUTTON_TEXT_BUTTON_H_
 #pragma once
 
 #include <string>
 
@@ skipping 330 matching lines @@
   IconPlacement icon_placement() { return icon_placement_; }
   void set_icon_placement(IconPlacement icon_placement) {
     icon_placement_ = icon_placement;
   }
 
   void set_ignore_minimum_size(bool ignore_minimum_size);
 
   // Overridden from View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual std::string GetClassName() const OVERRIDE;
+  virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
 
   // Overridden from TextButtonBase:
   virtual void PaintButton(gfx::Canvas* canvas, PaintButtonMode mode) OVERRIDE;
 
  protected:
   SkBitmap icon() const { return icon_; }
 
   virtual const SkBitmap& GetImageToPaint() const;
 
   // Overridden from NativeThemeDelegate:
@@ skipping 59 matching lines @@
   // Overridden from TextButton:
   virtual void GetExtraParams(
       gfx::NativeTheme::ExtraParams* params) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTextButton);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_BUTTON_TEXT_BUTTON_H_