Restructure public side of view_manager service.

mojo/services/public/cpp/view_manager/view_manager_delegate.h

-// Copyright 2014 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 MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_MANAGER_DELEGATE_H_
-#define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_MANAGER_DELEGATE_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "mojo/public/interfaces/application/service_provider.mojom.h"
-
-namespace mojo {
-
-class ServiceProviderImpl;
-class View;
-class ViewManager;
-
-// Interface implemented by an application using the view manager.
-class ViewManagerDelegate {
- public:
-  // Called when the application implementing this interface is embedded at
-  // |root|. |view_manager| is an implementation of an object bound to a
-  // connection to the view manager service. The object is valid until
-  // OnViewManagerDisconnected() is called with the same object.
-  // This function is called for every embed, but there will be a unique
-  // instance of |view_manager| only for every unique connection. See
-  // the class description of ViewManager for some rules about when a new
-  // connection is made.
-  // |exported_services| is an object that the delegate can add services to
-  // expose to the embedder. |imported_services| exposes the services offered by
-  // the embedder to the delegate. Note that if a different application is
-  // subsequently embedded at |root|, the pipe(s) connecting |imported_services|
-  // to the embedder and any services obtained from it are not broken and will
-  // continue to be valid.
-  virtual void OnEmbed(ViewManager* view_manager,
-                       View* root,
-                       ServiceProviderImpl* exported_services,
-                       scoped_ptr<ServiceProvider> imported_services) = 0;
-
-  // Called when a connection to the view manager service is closed.
-  // |view_manager| is not valid after this function returns.
-  virtual void OnViewManagerDisconnected(ViewManager* view_manager) = 0;
-
- protected:
-  virtual ~ViewManagerDelegate() {}
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_MANAGER_DELEGATE_H_