All together now

ui/compositor/compositor_retriever_delegate.h

+// Copyright (c) 2013 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_COMPOSITOR_COMPOSITOR_RETRIEVER_DELEGATE_H_
+#define UI_COMPOSITOR_COMPOSITOR_RETRIEVER_DELEGATE_H_
+
+namespace gfx {
+class Display;
+}
+
+namespace ui {
+
+class Compositor;
+
+// A class that allows retrieving a compositor associated with a display.
+class CompositorRetrieverDelegate {
+ public:
+  // Returns the compositor associated with the display.
+  virtual ui::Compositor* GetCompositorForDisplay(
+      const gfx::Display& display) = 0;
+
+  // Sets the CompositorRetrieverDelegate. Only one delegate may be registered.
+  static void SetDelegate(CompositorRetrieverDelegate* delegate);
+
+  // Gets the global CompositorRetrieverDelegate instance.
+  static CompositorRetrieverDelegate* GetInstance();
+};
+
+}  // namespace ui
+
+#endif  // UI_COMPOSITOR_COMPOSITOR_RETRIEVER_DELEGATE_H_