Add CHECK on file descriptor in various IPC::ChannelHandle passed in.

content/renderer/render_thread_impl.cc

 // Copyright (c) 2011 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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 780 matching lines @@
                                                &channel_handle,
                                                &renderer_process_for_gpu,
                                                &gpu_info)) ||
       channel_handle.name.empty() ||
       renderer_process_for_gpu == base::kNullProcessHandle) {
     // Otherwise cancel the connection.
     gpu_channel_ = NULL;
     return NULL;
   }
 
+#if defined(OS_POSIX)
+  // Check the validity of fd for bug investigation.  Replace with normal error
+  // handling (see above) after bug fixed. See for details: crbug.com/95732.
+  CHECK_NE(-1, channel_handle.socket.fd);
+#endif
+
   gpu_channel_->set_gpu_info(gpu_info);
   content::GetContentClient()->SetGpuInfo(gpu_info);
 
   // Connect to the GPU process if a channel name was received.
   gpu_channel_->Connect(channel_handle, renderer_process_for_gpu);
 
   return GetGpuChannel();
 }
 
 GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
@@ skipping 29 matching lines @@
 
 scoped_refptr<base::MessageLoopProxy>
 RenderThreadImpl::GetFileThreadMessageLoopProxy() {
   DCHECK(message_loop() == MessageLoop::current());
   if (!file_thread_.get()) {
     file_thread_.reset(new base::Thread("Renderer::FILE"));
     file_thread_->Start();
   }
   return file_thread_->message_loop_proxy();
 }