IPC: Fix attachment brokering race condition.

ipc/ipc_channel_nacl.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_nacl.h"
 
 #include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <sys/types.h>
@@ skipping 137 matching lines @@
   // This shouldn't actually get used in the untrusted side of the proxy, and we
   // don't have the real pid anyway.
   return -1;
 }
 
 base::ProcessId ChannelNacl::GetSelfPID() const {
   return -1;
 }
 
 bool ChannelNacl::Connect() {
+  WillConnect();
+
   if (pipe_ == -1) {
     DLOG(WARNING) << "Channel creation failed: " << pipe_name_;
     return false;
   }
 
   // Note that Connect is called on the "Channel" thread (i.e., the same thread
   // where Channel::Send will be called, and the same thread that should receive
   // messages). The constructor might be invoked on another thread (see
   // ChannelProxy for an example of that). Therefore, we must wait until Connect
   // is called to decide which SingleThreadTaskRunner to pass to
@@ skipping 230 matching lines @@
 
 // static
 std::unique_ptr<Channel> Channel::Create(
     const IPC::ChannelHandle& channel_handle,
     Mode mode,
     Listener* listener) {
   return base::WrapUnique(new ChannelNacl(channel_handle, mode, listener));
 }
 
 }  // namespace IPC