Make attachment broker a subclass of IPC::Listener.

ipc/attachment_broker_win.cc

 // Copyright 2015 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/attachment_broker_win.h"
 
+#include "base/process/process.h"
 #include "ipc/attachment_broker_messages.h"
 #include "ipc/brokerable_attachment.h"
 #include "ipc/handle_attachment_win.h"
 #include "ipc/ipc_sender.h"
 
 namespace IPC {
 
 AttachmentBrokerWin::AttachmentBrokerWin() {
 }
 
@@ skipping 21 matching lines @@
   return false;
 }
 
 bool AttachmentBrokerWin::GetAttachmentWithId(
     BrokerableAttachment::AttachmentId id,
     BrokerableAttachment* attachment) {
   // TODO(erikchen): Implement me. http://crbug.com/493414
   return false;
 }
 
+bool AttachmentBrokerWin::OnMessageReceived(const Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(AttachmentBrokerWin, msg)
+    IPC_MESSAGE_HANDLER(AttachmentBrokerMsg_WinHandleHasBeenDuplicated,
+                        OnWinHandleHasBeenDuplicated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void AttachmentBrokerWin::OnWinHandleHasBeenDuplicated(
+    const IPC::internal::HandleAttachmentWin::WireFormat& wire_format) {
+  // The IPC message was intended for a different process. Ignore it.
+  if (wire_format.destination_process != base::Process::Current().Pid())
+    return;
+
+  scoped_refptr<BrokerableAttachment> attachment(
+      new IPC::internal::HandleAttachmentWin(wire_format));
+  attachments_.push_back(attachment);
+}
+
 }  // namespace IPC