It is time.

ui/aura/client/capture_delegate.h

-// Copyright (c) 2012 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_CLIENT_CAPTURE_DELEGATE_H_
-#define UI_AURA_CLIENT_CAPTURE_DELEGATE_H_
-
-#include "ui/aura/aura_export.h"
-
-namespace aura {
-class Window;
-namespace client {
-
-// This interface provides API to change the root Window's capture state without
-// exposing them as RootWindow API.
-class AURA_EXPORT CaptureDelegate {
- public:
-  // Called when a capture is set on |new_capture| and/or a capture is
-  // released on |old_capture|.
-  // NOTE: |old_capture| and |new_capture| are not necessarily contained in the
-  // window hierarchy of the delegate.
-  virtual void UpdateCapture(aura::Window* old_capture,
-                             aura::Window* new_capture) = 0;
-
-  // Called when another root gets capture.
-  virtual void OnOtherRootGotCapture() = 0;
-
-  // Sets/Release a native capture on host windows.
-  virtual void SetNativeCapture() = 0;
-  virtual void ReleaseNativeCapture() = 0;
-
- protected:
-  virtual ~CaptureDelegate() {}
-};
-
-}  // namespace client
-}  // namespace aura
-
-#endif  // UI_AURA_CLIENT_CAPTURE_DELEGATE_H_