Add a temporary CHECK to IPC::Channel::Send() to help track down crash.

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 <sys/socket.h>
@@ skipping 509 matching lines @@
       DVLOG(2) << "sent message @" << msg << " on channel @" << this
                << " with type " << msg->type() << " on fd " << pipe_;
       delete output_queue_.front();
       output_queue_.pop();
     }
   }
   return true;
 }
 
 bool Channel::ChannelImpl::Send(Message* message) {
+  CHECK(message) << "crbug.com/357915";  // TODO(vtl): Remove once bug resolved.
   DVLOG(2) << "sending message @" << message << " on channel @" << this
            << " with type " << message->type()
            << " (" << output_queue_.size() << " in queue)";
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
   Logging::GetInstance()->OnSendMessage(message, "");
 #endif  // IPC_MESSAGE_LOG_ENABLED
 
   message->TraceMessageBegin();
   output_queue_.push(message);
@@ skipping 577 matching lines @@
 
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelImpl::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC