Changes ownership of WindowTreeHostConnection

components/mus/ws/window_tree_host_delegate.h

-// 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_MUS_WS_WINDOW_TREE_HOST_DELEGATE_H_
-#define COMPONENTS_MUS_WS_WINDOW_TREE_HOST_DELEGATE_H_
-
-namespace mus {
-
-namespace ws {
-
-class WindowTreeImpl;
-
-// A WindowTreeHostDelegate interface is implemented by an object that
-// has the WindowTreeImpl that is associated with the WindowTreeHostImpl that
-// holds a pointer to this object. Typically, a WindowTreeHostDelegate will also
-// manage the lifetime of the WindowTreeHostImpl and will delete the object when
-// it get informed of when the Display of the root is closed.
-class WindowTreeHostDelegate {
- public:
-  // Called when the window associated with the root is completely initialized
-  // (i.e. the ViewportMetrics for the display is known).
-  virtual void OnDisplayInitialized() = 0;
-
-  // Called when the window associated with the root is closed.
-  virtual void OnDisplayClosed() = 0;
-
-  // Returns the WindowTreeImpl associated with the delegate.
-  virtual const WindowTreeImpl* GetWindowTree() const = 0;
-  WindowTreeImpl* GetWindowTree() {
-    return const_cast<WindowTreeImpl*>(
-        const_cast<const WindowTreeHostDelegate*>(this)->GetWindowTree());
-  }
-
- protected:
-  virtual ~WindowTreeHostDelegate() {}
-};
-
-}  // namespace ws
-
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_WS_WINDOW_TREE_HOST_DELEGATE_H_