Mojo: More plumbing required to transfer handles over MessagePipes.

mojo/system/proxy_message_pipe_endpoint.h

 // Copyright 2013 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_SYSTEM_PROXY_MESSAGE_PIPE_ENDPOINT_H_
 #define MOJO_SYSTEM_PROXY_MESSAGE_PIPE_ENDPOINT_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 27 matching lines @@
 //  - When attached, a |ProxyMessagePipeEndpoint| starts out not running. When
 //    run, it gets a remote ID.
 class MOJO_SYSTEM_EXPORT ProxyMessagePipeEndpoint : public MessagePipeEndpoint {
  public:
   ProxyMessagePipeEndpoint();
   virtual ~ProxyMessagePipeEndpoint();
 
   // |MessagePipeEndpoint| implementation:
   virtual void Close() OVERRIDE;
   virtual bool OnPeerClose() OVERRIDE;
-  virtual MojoResult EnqueueMessage(
+  virtual MojoResult CanEnqueueMessage(
+      const MessageInTransit* message,
+      const std::vector<Dispatcher*>* dispatchers) OVERRIDE;
+  virtual void EnqueueMessage(
       MessageInTransit* message,
-      const std::vector<Dispatcher*>* dispatchers) OVERRIDE;
+      std::vector<scoped_refptr<Dispatcher> >* dispatchers) OVERRIDE;
   virtual void Attach(scoped_refptr<Channel> channel,
                       MessageInTransit::EndpointId local_id) OVERRIDE;
   virtual bool Run(MessageInTransit::EndpointId remote_id) OVERRIDE;
 
  private:
   bool is_attached() const {
     return !!channel_.get();
   }
 
   bool is_running() const {
@@ skipping 26 matching lines @@
   // not ready to send them yet.
   std::deque<MessageInTransit*> paused_message_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyMessagePipeEndpoint);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_PROXY_MESSAGE_PIPE_ENDPOINT_H_