[mojo-edk] Duplicate process handle and take ownership in NodeChannel.

mojo/edk/system/node_controller.cc

 // Copyright 2016 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 "mojo/edk/system/node_controller.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
@@ skipping 161 matching lines @@
   ports::NodeName node_name;
   GenerateRandomName(&node_name);
 
   {
     base::AutoLock lock(reserved_ports_lock_);
     bool inserted = pending_child_tokens_.insert(
         std::make_pair(node_name, child_token)).second;
     DCHECK(inserted);
   }
 
+#if defined(OS_WIN)
+  // On Windows, we need to duplicate the process handle because we have no
+  // control over its lifetime and it may become invalid by the time the posted
+  // task runs.
+  HANDLE dup_handle = INVALID_HANDLE_VALUE;
+  BOOL ok = ::DuplicateHandle(
+      base::GetCurrentProcessHandle(), process_handle,
+      base::GetCurrentProcessHandle(), &dup_handle,
+      0, FALSE, DUPLICATE_SAME_ACCESS);
+  DPCHECK(ok);
+  process_handle = dup_handle;
+#endif
+
   io_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&NodeController::ConnectToChildOnIOThread,
                  base::Unretained(this),
                  process_handle,
                  base::Passed(&platform_handle),
                  node_name,
                  process_error_callback));
 }
 
@@ skipping 998 matching lines @@
     shutdown_callback_flag_.Set(false);
   }
 
   DCHECK(!callback.is_null());
 
   callback.Run();
 }
 
 }  // namespace edk
 }  // namespace mojo