Make toasts notice when they're hidden and send the mouse-out event.

ui/message_center/views/toast_contents_view.h

 // 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_MESSAGE_CENTER_VIEWS_TOAST_CONTENTS_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_TOAST_CONTENTS_VIEW_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/base/animation/animation_delegate.h"
@@ skipping 51 matching lines @@
 
   // Computes the size of the toast assuming it will host the given view.
   static gfx::Size GetToastSizeForView(views::View* view);
 
   // Overridden from views::View:
   virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
+  virtual void VisibilityChanged(
+      views::View* starting_from,
+      bool is_visible) OVERRIDE;
 
  private:
   // Overridden from ui::AnimationDelegate:
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
   virtual void AnimationCanceled(const ui::Animation* animation) OVERRIDE;
 
   // Overridden from views::WidgetDelegate:
   virtual views::View* GetContentsView() OVERRIDE;
   virtual void WindowClosing() OVERRIDE;
@@ skipping 30 matching lines @@
 
   gfx::Point origin_;
   gfx::Size preferred_size_;
 
   DISALLOW_COPY_AND_ASSIGN(ToastContentsView);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_VIEWS_TOAST_CONTENTS_VIEW_H_