Re-factor Ash Message Center code part 2/4

ash/system/tray/tray_bubble_wrapper.h

Index: ash/system/tray/tray_bubble_wrapper.h
diff --git a/ash/system/tray/tray_bubble_wrapper.h b/ash/system/tray/tray_bubble_wrapper.h
new file mode 100644
index 0000000000000000000000000000000000000000..c72fe29e7166b6dc05fcbcdbb191016c0f1c72a9
--- /dev/null
+++ b/ash/system/tray/tray_bubble_wrapper.h
@@ -0,0 +1,44 @@
+// 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 ASH_SYSTEM_TRAY_TRAY_BUBBLE_WRAPPER_H_
+#define ASH_SYSTEM_TRAY_TRAY_BUBBLE_WRAPPER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/views/widget/widget_observer.h"
+
+class TrayBubbleView;
+
+namespace ash {
+namespace internal {
+
+class TrayBackgroundView;
+class TrayEventFilter;
+
+class TrayBubbleWrapper : public views::WidgetObserver {
+ public:
+  TrayBubbleWrapper(TrayBackgroundView* tray, TrayBubbleView* bubble_view);
+  virtual ~TrayBubbleWrapper();
+
+  // views::WidgetObserver overrides:
+  void OnWidgetClosing(views::Widget* widget);
+
+  TrayBackgroundView* tray() { return tray_; }
+  TrayBubbleView* bubble_view() { return bubble_view_; }
+  views::Widget* bubble_widget() { return bubble_widget_; }
+
+ private:
+  TrayBackgroundView* tray_;
+  TrayBubbleView* bubble_view_;  // unowned
+  views::Widget* bubble_widget_;
+  scoped_ptr<TrayEventFilter> tray_event_filter_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayBubbleWrapper);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_TRAY_BUBBLE_WRAPPER_H_