Stub in more IPC attachment brokering functionality.

ipc/ipc_message.cc

 // 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.
 
 #include "ipc/ipc_message.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "ipc/ipc_message_attachment.h"
@@ skipping 139 matching lines @@
 
   *attachment = attachment_set->GetAttachmentAt(descriptor_index);
   return nullptr != attachment->get();
 }
 
 bool Message::HasAttachments() const {
   return attachment_set_.get() && !attachment_set_->empty();
 }
 
 bool Message::HasMojoHandles() const {
-  return attachment_set_.get() && 0 < attachment_set_->num_mojo_handles();
+  return attachment_set_.get() && attachment_set_->num_mojo_handles() > 0;
+}
+
+bool Message::HasBrokerableAttachments() const {
+  return attachment_set_.get() &&
+         attachment_set_->num_brokerable_attachments() > 0;
 }
 
 }  // namespace IPC