Revert "Delete the ViewManager and WindowManager services."

services/view_manager/focus_controller_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 SERVICES_VIEW_MANAGER_FOCUS_CONTROLLER_DELEGATE_H_
+#define SERVICES_VIEW_MANAGER_FOCUS_CONTROLLER_DELEGATE_H_
+
+namespace view_manager {
+
+class ServerView;
+
+class FocusControllerDelegate {
+ public:
+  virtual void OnFocusChanged(ServerView* old_focused_view,
+                              ServerView* new_focused_view) = 0;
+
+ protected:
+  ~FocusControllerDelegate() {}
+};
+
+}  // namespace view_manager
+
+#endif  // SERVICES_VIEW_MANAGER_FOCUS_CONTROLLER_DELEGATE_H_