mus: move View Manager to components/mus/vm

components/mus/display_manager_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_DISPLAY_MANAGER_DELEGATE_H_
-#define COMPONENTS_MUS_DISPLAY_MANAGER_DELEGATE_H_
-
-#include "components/mus/ids.h"
-#include "components/mus/public/interfaces/view_tree.mojom.h"
-
-namespace cc {
-struct SurfaceId;
-}
-
-namespace mus {
-
-class ServerView;
-
-// A DisplayManagerDelegate an interface to be implemented by an object that
-// manages the lifetime of a DisplayManager, forwards events to the appropriate
-// views, and responses to changes in viewport size.
-class DisplayManagerDelegate {
- public:
-  // Returns the root view of this display.
-  virtual ServerView* GetRootView() = 0;
-
-  // Called when the window managed by the DisplayManager is closed.
-  virtual void OnDisplayClosed() = 0;
-
-  // Called when an event arrives.
-  virtual void OnEvent(mojo::EventPtr event) = 0;
-
-  // Signals that the metrics of this display's viewport has changed.
-  virtual void OnViewportMetricsChanged(
-      const mojo::ViewportMetrics& old_metrics,
-      const mojo::ViewportMetrics& new_metrics) = 0;
-
-  virtual void OnTopLevelSurfaceChanged(cc::SurfaceId surface_id) = 0;
-
- protected:
-  virtual ~DisplayManagerDelegate() {}
-};
-
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_DISPLAY_MANAGER_DELEGATE_H_