Reify view ownership as a message pipe.

services/ui/view_manager/view_manager_impl.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_VIEW_MANAGER_VIEW_MANAGER_IMPL_H_
 #define SERVICES_UI_VIEW_MANAGER_VIEW_MANAGER_IMPL_H_
 
 #include "base/macros.h"
 #include "mojo/services/ui/views/interfaces/view_manager.mojom.h"
 #include "services/ui/view_manager/view_registry.h"
 
 namespace view_manager {
 
 // ViewManager interface implementation.
 class ViewManagerImpl : public mojo::ui::ViewManager {
  public:
   explicit ViewManagerImpl(ViewRegistry* registry);
   ~ViewManagerImpl() override;
 
  private:
   // |ViewManager|:
   void RegisterView(
       mojo::ui::ViewPtr view,
       mojo::InterfaceRequest<mojo::ui::ViewHost> view_host_request,
-      const mojo::String& label,
-      const RegisterViewCallback& callback) override;
+      mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
+      const mojo::String& label) override;
   void RegisterViewTree(
       mojo::ui::ViewTreePtr view_tree,
       mojo::InterfaceRequest<mojo::ui::ViewTreeHost> view_tree_host_request,
-      const mojo::String& label,
-      const RegisterViewTreeCallback& callback) override;
+      const mojo::String& label) override;
 
   ViewRegistry* registry_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewManagerImpl);
 };
 
 }  // namespace view_manager
 
 #endif  // SERVICES_UI_VIEW_MANAGER_VIEW_MANAGER_IMPL_H_