IPC: Fix attachment brokering race condition.

ipc/ipc_channel_posix.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_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 320 matching lines @@
 #else
     server_listen_pipe_.reset(local_pipe.release());
 #endif
   } else {
     pipe_.reset(local_pipe.release());
   }
   return true;
 }
 
 bool ChannelPosix::Connect() {
+  WillConnect();
+
   if (!server_listen_pipe_.is_valid() && !pipe_.is_valid()) {
     DLOG(WARNING) << "Channel creation failed: " << pipe_name_;
     return false;
   }
 
   bool did_connect = true;
   if (server_listen_pipe_.is_valid()) {
 #if defined(OS_NACL_NONSFI)
     LOG(FATAL) << "IPC channels in nacl_helper_nonsfi "
                << "should always be in client mode.";
@@ skipping 777 matching lines @@
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelPosix::SetGlobalPid(pid);
 }
 int Channel::GetGlobalPid() {
   return ChannelPosix::GetGlobalPid();
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC