Reify view ownership as a message pipe.

services/ui/launcher/launcher_app.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_UI_LAUNCHER_LAUNCHER_APP_H_
 #define SERVICES_UI_LAUNCHER_LAUNCHER_APP_H_
 
 #include <memory>
 
 #include "mojo/common/tracing_impl.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/services/gfx/composition/interfaces/compositor.mojom.h"
 #include "mojo/services/native_viewport/interfaces/native_viewport.mojom.h"
 #include "mojo/services/native_viewport/interfaces/native_viewport_event_dispatcher.mojom.h"
 #include "mojo/services/ui/views/interfaces/view_manager.mojom.h"
-#include "mojo/services/ui/views/interfaces/view_provider.mojom.h"
 
 namespace launcher {
 
 class LauncherViewTree;
 
 class LauncherApp : public mojo::ApplicationDelegate,
                     public mojo::NativeViewportEventDispatcher {
  public:
   LauncherApp();
   ~LauncherApp() override;
 
  private:
   // |ApplicationDelegate|:
   void Initialize(mojo::ApplicationImpl* app_impl) override;
 
   // |NativeViewportEventDispatcher|:
   void OnEvent(mojo::EventPtr event,
                const mojo::Callback<void()>& callback) override;
 
   void OnCompositorConnectionError();
   void OnViewManagerConnectionError();
 
   void InitViewport();
   void OnViewportConnectionError();
   void OnViewportCreated(mojo::ViewportMetricsPtr metrics);
   void OnViewportMetricsChanged(mojo::ViewportMetricsPtr metrics);
   void RequestUpdatedViewportMetrics();
 
   void LaunchClient(std::string app_url);
-  void OnClientConnectionError();
-  void OnClientViewCreated(mojo::ui::ViewTokenPtr view_token);
 
   void UpdateClientView();
 
   void Shutdown();
 
   mojo::ApplicationImpl* app_impl_;
   mojo::TracingImpl tracing_;
 
   mojo::gfx::composition::CompositorPtr compositor_;
   mojo::ui::ViewManagerPtr view_manager_;
 
   mojo::NativeViewportPtr viewport_;
   mojo::Binding<NativeViewportEventDispatcher>
       viewport_event_dispatcher_binding_;
 
   std::unique_ptr<LauncherViewTree> view_tree_;
 
-  mojo::ui::ViewProviderPtr client_view_provider_;
-  mojo::ui::ViewTokenPtr client_view_token_;
+  mojo::ui::ViewOwnerPtr client_view_owner_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherApp);
 };
 
 }  // namespace launcher
 
 #endif  // SERVICES_UI_LAUNCHER_LAUNCHER_APP_H_