Pass ServiceProvider thru ViewManagerService::Embed() allowing embedder & embeddee to expose servic…

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 Node;
 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.
-  virtual void OnEmbed(ViewManager* view_manager, Node* root) = 0;
+  // |exported_services| is an object that the delegate can add services to 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,
+                       Node* 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_