remoting: Add AttachmentBroker for daemon and desktop processes

remoting/host/win/unprivileged_process_delegate.cc

Index: remoting/host/win/unprivileged_process_delegate.cc
diff --git a/remoting/host/win/unprivileged_process_delegate.cc b/remoting/host/win/unprivileged_process_delegate.cc
index b7fb879393d380089958819485944b52ed2e9b97..97d6907e3d94a4ba6c5173cc8f99b8155d7521de 100644
--- a/remoting/host/win/unprivileged_process_delegate.cc
+++ b/remoting/host/win/unprivileged_process_delegate.cc
@@ -23,6 +23,7 @@
 #include "base/synchronization/lock.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/windows_version.h"
+#include "ipc/attachment_broker.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_message.h"
@@ -336,6 +337,9 @@ void UnprivilegedProcessDelegate::LaunchProcess(
   }
 
   channel_ = std::move(server);
+  IPC::AttachmentBroker::GetGlobal()->RegisterCommunicationChannel(
+      channel_.get());
+
   ReportProcessLaunched(std::move(worker_process));
 }
 
@@ -352,13 +356,18 @@ void UnprivilegedProcessDelegate::Send(IPC::Message* message) {
 void UnprivilegedProcessDelegate::CloseChannel() {
   DCHECK(CalledOnValidThread());
 
+  if (!channel_)
+    return;
+
+  IPC::AttachmentBroker::GetGlobal()->DeregisterCommunicationChannel(
+      channel_.get());
   channel_.reset();
 }
 
 void UnprivilegedProcessDelegate::KillProcess() {
   DCHECK(CalledOnValidThread());
 
-  channel_.reset();
+  CloseChannel();
   event_handler_ = nullptr;
 
   if (worker_process_.IsValid()) {