1 files changed, 36 insertions, 0 deletions
diff --git a/chromium/ui/aura/window_tree_host_observer.h b/chromium/ui/aura/window_tree_host_observer.h
new file mode 100644
index 00000000000..d96e9d3b24d
--- /dev/null
+++ b/chromium/ui/aura/window_tree_host_observer.h
@@ -0,0 +1,36 @@
+// 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_AURA_WINDOW_TREE_HOST_OBSERVER_H_
+#define UI_AURA_WINDOW_TREE_HOST_OBSERVER_H_
+
+#include "ui/aura/aura_export.h"
+
+namespace gfx {
+class Point;
+}
+
+namespace aura {
+class Window;
+class WindowTreeHost;
+
+class AURA_EXPORT WindowTreeHostObserver {
+ public:
+  // Called when the host's client size has changed.
+  virtual void OnHostResized(const WindowTreeHost* host) {}
+
+  // Called when the host is moved on screen.
+  virtual void OnHostMoved(const WindowTreeHost* host,
+                           const gfx::Point& new_origin) {}
+
+  // Called when the native window system sends the host request to close.
+  virtual void OnHostCloseRequested(const WindowTreeHost* host) {}
+
+ protected:
+  virtual ~WindowTreeHostObserver() {}
+};
+
+}  // namespace aura
+
+#endif  // UI_AURA_WINDOW_TREE_HOST_OBSERVER_H_