Animated Rotation

ui/gfx/compositor/layer_observer.h

Index: ui/gfx/compositor/layer_observer.h
diff --git a/ui/gfx/compositor/layer_observer.h b/ui/gfx/compositor/layer_observer.h
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+// Copyright (c) 2011 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_GFX_COMPOSITOR_LAYER_OBSERVER_H_
+#define UI_GFX_COMPOSITOR_LAYER_OBSERVER_H_
+#pragma once
+
+namespace ui {
+
+class Layer;
+
+// Paint listeners can be installed on views to allow other parties to be
+// notified when compositing completes.
+class LayerObserver {
+ public:
+  // This is called after every draw.
+  virtual void OnDraw(Layer* view) = 0;
+
+ protected:
+  virtual ~LayerObserver() {}
+};
+
+} // namespace ui
+
+#endif // UI_GFX_COMPOSITOR_LAYER_OBSERVER_H_