Stub in more IPC attachment brokering functionality.

ipc/ipc_message.h

 // Copyright (c) 2012 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 IPC_IPC_MESSAGE_H_
 #define IPC_IPC_MESSAGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 159 matching lines @@
   // false iff the set is full.
   bool WriteAttachment(scoped_refptr<MessageAttachment> attachment);
   // ReadAttachment parses an attachment given the parsing state |iter| and
   // writes it to |*attachment|. It returns true on success.
   bool ReadAttachment(base::PickleIterator* iter,
                       scoped_refptr<MessageAttachment>* attachment) const;
   // Returns true if there are any attachment in this message.
   bool HasAttachments() const;
   // Returns true if there are any MojoHandleAttachments in this message.
   bool HasMojoHandles() const;
+  // Whether the message has any brokerable attachments.
+  bool HasBrokerableAttachments() const;
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
   // Adds the outgoing time from Time::Now() at the end of the message and sets
   // a bit to indicate that it's been added.
   void set_sent_time(int64 time);
   int64 sent_time() const;
 
   void set_received_time(int64 time) const;
   int64 received_time() const { return received_time_; }
   void set_output_params(const std::string& op) const { output_params_ = op; }
@@ skipping 84 matching lines @@
   MSG_ROUTING_NONE = -2,
 
   // indicates a general message not sent to a particular tab.
   MSG_ROUTING_CONTROL = kint32max,
 };
 
 #define IPC_REPLY_ID 0xFFFFFFF0  // Special message id for replies
 #define IPC_LOGGING_ID 0xFFFFFFF1  // Special message id for logging
 
 #endif  // IPC_IPC_MESSAGE_H_