diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/rand_util_posix.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/rand_util_posix.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+// Copyright (c) 2008 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 "base/rand_util.h"
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "base/file_util.h"
+#include "base/logging.h"
+
+namespace base {
+
+uint64_t RandUint64() {
+  uint64_t number;
+
+  int urandom_fd = open("/dev/urandom", O_RDONLY);
+  CHECK(urandom_fd >= 0);
+  bool success = file_util::ReadFromFD(urandom_fd,
+                                       reinterpret_cast<char*>(&number),
+                                       sizeof(number));
+  CHECK(success);
+  close(urandom_fd);
+
+  return number;
+}
+
+}  // namespace base