Add untrusted NaCl build for PPAPI proxy.

base/rand_util_nacl.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 "base/rand_util.h"
-
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-
-// TODO(bbudge) Replace this with a proper system header file when NaCl
-// provides one.
-#include "native_client/src/untrusted/irt/irt.h"
-
-namespace {
-
-// Create a wrapper class so we can cache the NaCl random number interface.
-class URandomInterface {
- public:
-  URandomInterface() {
-    size_t result = nacl_interface_query(NACL_IRT_RANDOM_v0_1,
-                                         &interface_,
-                                         sizeof(interface_));
-    DCHECK_EQ(result, sizeof(interface_)) << "Can't get random interface.";
-  }
-
-  uint64 get_random_bytes() const {
-    size_t nbytes;
-    uint64 result;
-    int error = interface_.get_random_bytes(&result,
-                                            sizeof(result),
-                                            &nbytes);
-    DCHECK_EQ(error, 0);
-    DCHECK_EQ(nbytes, sizeof(result));
-    return result;
-  }
-
- private:
-  struct nacl_irt_random interface_;
-};
-
-base::LazyInstance<URandomInterface> g_urandom_interface =
-    LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-namespace base {
-
-uint64 RandUint64() {
-  return g_urandom_interface.Pointer()->get_random_bytes();
-}
-
-}  // namespace base
-