1 files changed, 30 insertions, 0 deletions
diff --git a/chromium/ui/views/widget/widget_removals_observer.h b/chromium/ui/views/widget/widget_removals_observer.h
new file mode 100644
index 00000000000..e62acab36a4
--- /dev/null
+++ b/chromium/ui/views/widget/widget_removals_observer.h
@@ -0,0 +1,30 @@
+// Copyright 2014 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_VIEWS_WIDGET_WIDGET_REMOVALS_OBSERVER_H_
+#define UI_VIEWS_WIDGET_WIDGET_REMOVALS_OBSERVER_H_
+
+#include "ui/views/views_export.h"
+
+namespace views {
+
+class Widget;
+class View;
+
+// |WidgetRemovalsObserver| complements |WidgetObserver| with additional
+// notifications. These include events occurring during tear down like view
+// removal. For this reason, it is recommended that subclasses not also inherit
+// from |View|.
+class VIEWS_EXPORT WidgetRemovalsObserver {
+ public:
+  // Called immediately before a descendant view of |widget| is removed.
+  virtual void OnWillRemoveView(Widget* widget, View* view) {}
+
+ protected:
+  virtual ~WidgetRemovalsObserver() {}
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_WIDGET_REMOVALS_OBSERVER_H_