Send an EVENT_SYSTEM_ALERT when a user first places focus within an infobar.

chrome/browser/views/infobars/infobars.h

 // 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 CHROME_BROWSER_VIEWS_INFOBARS_INFOBARS_H_
 #define CHROME_BROWSER_VIEWS_INFOBARS_INFOBARS_H_
 #pragma once
 
 #include "app/animation.h"
 #include "base/task.h"
 #include "chrome/browser/tab_contents/infobar_delegate.h"
 #include "views/controls/button/button.h"
 #include "views/controls/link.h"
+#include "views/focus/focus_manager.h"
 
 class InfoBarContainer;
 class SlideAnimation;
 namespace views {
 class ExternalFocusTracker;
 class ImageButton;
 class ImageView;
 class Label;
 class NativeButton;
 }
@@ skipping 10 matching lines @@
   virtual void Paint(gfx::Canvas* canvas, views::View* view) const;
 
  private:
   scoped_ptr<views::Background> gradient_background_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarBackground);
 };
 
 class InfoBar : public views::View,
                 public views::ButtonListener,
+                public views::FocusChangeListener,
                 public AnimationDelegate {
  public:
   explicit InfoBar(InfoBarDelegate* delegate);
   virtual ~InfoBar();
 
   InfoBarDelegate* delegate() const { return delegate_; }
 
   // Set a link to the parent InfoBarContainer. This must be set before the
   // InfoBar is added to the view hierarchy.
   void set_container(InfoBarContainer* container) { container_ = container; }
@@ skipping 38 matching lines @@
 
   // Returns a centered y-position of a control of height specified in
   // |prefsize| within the standard InfoBar height, adjusted according to the
   // current amount of animation offset the |parent| InfoBar currently has.
   // Changes during an animation.
   int OffsetY(views::View* parent, const gfx::Size prefsize);
 
   // Overridden from views::ButtonListener:
   virtual void ButtonPressed(views::Button* sender, const views::Event& event);
 
+  // Overridden from views::FocusChangeListener:
+  virtual void FocusWillChange(View* focused_before, View* focused_now);
+
   // Overridden from AnimationDelegate:
   virtual void AnimationProgressed(const Animation* animation);
   virtual void AnimationEnded(const Animation* animation);
 
  private:
   friend class InfoBarContainer;
 
   // Starts animating the InfoBar open.
   void AnimateOpen();
 
@@ skipping 125 matching lines @@
   views::NativeButton* cancel_button_;
   views::Link* link_;
 
   bool initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ConfirmInfoBar);
 };
 
 
 #endif  // CHROME_BROWSER_VIEWS_INFOBARS_INFOBARS_H_