Fix an attachment broker race condition.

ipc/ipc_channel_win.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_channel_win.h"
 
 #include <windows.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 245 matching lines @@
     return;
   }
 
   peer_pid_ = claimed_pid;
   // Validation completed.
   validate_client_ = false;
 
   listener()->OnChannelConnected(claimed_pid);
 
   FlushPrelimQueue();
+
+  if (IsAttachmentBrokerEndpoint() &&
+      AttachmentBroker::GetGlobal()->IsPrivilegedBroker()) {
+    AttachmentBroker::GetGlobal()->ReceivedPeerPid(claimed_pid);
+  }
 }
 
 base::ProcessId ChannelWin::GetSenderPID() {
   return GetPeerPID();
 }
 
 bool ChannelWin::IsAttachmentBrokerEndpoint() {
   return is_attachment_broker_endpoint();
 }
 
@@ skipping 325 matching lines @@
   int secret;
   do {  // Guarantee we get a non-zero value.
     secret = base::RandInt(0, std::numeric_limits<int>::max());
   } while (secret == 0);
 
   id.append(GenerateUniqueRandomChannelID());
   return id.append(base::StringPrintf("\\%d", secret));
 }
 
 }  // namespace IPC