Revert of mash: Convert TrayBackgroundView to wm common types

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..2e82b40c0c492ca984be9c17dce7e5d19c3994a4
--- /dev/null
+++ b/ash/system/tray/tray_bubble_wrapper.h
@@ -0,0 +1,47 @@
+// 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/macros.h"
+#include "ui/views/widget/widget_observer.h"
+
+namespace views {
+class TrayBubbleView;
+}
+
+namespace ash {
+class TrayBackgroundView;
+class TrayEventFilter;
+
+// Creates and manages the Widget and EventFilter components of a bubble.
+
+class TrayBubbleWrapper : public views::WidgetObserver {
+ public:
+  TrayBubbleWrapper(TrayBackgroundView* tray,
+                    views::TrayBubbleView* bubble_view);
+  ~TrayBubbleWrapper() override;
+
+  // views::WidgetObserver overrides:
+  void OnWidgetDestroying(views::Widget* widget) override;
+  void OnWidgetBoundsChanged(views::Widget* widget,
+                             const gfx::Rect& new_bounds) override;
+
+  const TrayBackgroundView* tray() const { return tray_; }
+  TrayBackgroundView* tray() { return tray_; }
+  const views::TrayBubbleView* bubble_view() const { return bubble_view_; }
+  const views::Widget* bubble_widget() const { return bubble_widget_; }
+
+ private:
+  TrayBackgroundView* tray_;
+  views::TrayBubbleView* bubble_view_;  // unowned
+  views::Widget* bubble_widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayBubbleWrapper);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_TRAY_BUBBLE_WRAPPER_H_