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+// Copyright 2015 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 COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_
+#define COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_
+
+namespace view_manager {
+
+class ServerView;
+
+class ServerViewDrawnTrackerObserver {
+ public:
+ // Invoked when the drawn state changes. If |is_drawn| is false |ancestor|
+ // identifies where the change occurred. In the case of a remove |ancestor| is
+ // the parent of the view that was removed. In the case of a visibility change
+ // |ancestor| is the parent of the view whose visibility changed.
+ virtual void OnDrawnStateChanged(ServerView* ancestor,
+ ServerView* view,
+ bool is_drawn) {}
+
+ protected:
+ virtual ~ServerViewDrawnTrackerObserver() {}
+};
+
+} // namespace view_manager
+
+#endif // COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_