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

content/renderer/pepper_plugin_delegate_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/pepper_plugin_delegate_impl.h"
 
 #include <cmath>
 #include <queue>
 
 #include "base/bind.h"
@@ skipping 509 matching lines @@
 
   bool Init(base::ProcessHandle plugin_process_handle,
             const IPC::ChannelHandle& channel_handle,
             PP_Module pp_module,
             ppapi::proxy::Dispatcher::GetInterfaceFunc local_get_interface,
             const ppapi::Preferences& preferences) {
     if (channel_handle.name.empty())
       return false;
 
 #if defined(OS_POSIX)
+    // Check the validity of fd for bug investigation. Remove after fixed.
+    // See for details: crbug.com/103957.
+    CHECK_NE(-1, channel_handle.socket.fd);
     if (channel_handle.socket.fd == -1)
       return false;
 #endif
 
     dispatcher_delegate_.reset(new DispatcherDelegate);
     dispatcher_.reset(new ppapi::proxy::HostDispatcher(
         plugin_process_handle, pp_module, local_get_interface));
 
     if (!dispatcher_->InitHostWithChannel(dispatcher_delegate_.get(),
                                           channel_handle,
@@ skipping 1391 matching lines @@
   if (!context)
     return NULL;
   if (!context->makeContextCurrent() || context->isContextLost())
     return NULL;
 
   RendererGLContext* parent_context = context->context();
   if (!parent_context)
     return NULL;
   return parent_context;
 }