ipc: Make a new class PlaceholderBrokerableAttachment.

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 <limits.h>
 
 #include "base/atomic_sequence_num.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "ipc/ipc_message_attachment.h"
 #include "ipc/ipc_message_attachment_set.h"
+#include "ipc/placeholder_brokerable_attachment.h"
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #include "ipc/ipc_platform_file_attachment_posix.h"
 #endif
 
 namespace {
 
 base::StaticAtomicSequenceNumber g_ref_num;
 
@@ skipping 149 matching lines @@
   }
   info->message_end =
       pickle_end + num_attachments * BrokerableAttachment::kNonceSize;
 #else
   info->message_end = pickle_end;
 #endif  // USE_ATTACHMENT_BROKER
 
   info->message_found = true;
 }
 
+bool Message::AddPlaceholderBrokerableAttachmentWithId(
+    BrokerableAttachment::AttachmentId id) {
+  scoped_refptr<PlaceholderBrokerableAttachment> attachment(
+      new PlaceholderBrokerableAttachment(id));
+  return attachment_set()->AddAttachment(attachment);
+}
+
 bool Message::WriteAttachment(scoped_refptr<MessageAttachment> attachment) {
   // We write the index of the descriptor so that we don't have to
   // keep the current descriptor as extra decoding state when deserialising.
   WriteInt(attachment_set()->size());
   return attachment_set()->AddAttachment(attachment);
 }
 
 bool Message::ReadAttachment(
     base::PickleIterator* iter,
     scoped_refptr<MessageAttachment>* attachment) const {
@@ skipping 16 matching lines @@
 bool Message::HasMojoHandles() const {
   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