Revert of mash: Convert TrayBackgroundView to wm common types

ash/system/tray/tray_event_filter.h

Index: ash/system/tray/tray_event_filter.h
diff --git a/ash/system/tray/tray_event_filter.h b/ash/system/tray/tray_event_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..ceee4d30bd94b0408dc543c5f0c08f2d7a538299
--- /dev/null
+++ b/ash/system/tray/tray_event_filter.h
@@ -0,0 +1,53 @@
+// 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_EVENT_FILTER_H_
+#define ASH_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_
+
+#include <set>
+
+#include "base/macros.h"
+#include "ui/views/pointer_watcher.h"
+
+namespace gfx {
+class Point;
+}
+
+namespace ui {
+class LocatedEvent;
+}
+
+namespace ash {
+class TrayBubbleWrapper;
+
+// Handles events for a tray bubble, e.g. to close the system tray bubble when
+// the user clicks outside it.
+class TrayEventFilter : public views::PointerWatcher {
+ public:
+  TrayEventFilter();
+  ~TrayEventFilter() override;
+
+  void AddWrapper(TrayBubbleWrapper* wrapper);
+  void RemoveWrapper(TrayBubbleWrapper* wrapper);
+
+  // views::PointerWatcher:
+  void OnMousePressed(const ui::MouseEvent& event,
+                      const gfx::Point& location_in_screen,
+                      views::Widget* target) override;
+  void OnTouchPressed(const ui::TouchEvent& event,
+                      const gfx::Point& location_in_screen,
+                      views::Widget* target) override;
+
+ private:
+  void ProcessPressedEvent(const gfx::Point& location_in_screen,
+                           views::Widget* target);
+
+  std::set<TrayBubbleWrapper*> wrappers_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayEventFilter);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_