Restructure the ipc_fuzzer directory.

tools/ipc_fuzzer/mutate/rand_util.h

-// Copyright 2014 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.
-
-#ifndef TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
-#define TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_
-
-#include "base/basictypes.h"
-#include "third_party/mt19937ar/mt19937ar.h"
-
-namespace ipc_fuzzer {
-
-extern MersenneTwister* g_mersenne_twister;
-
-void InitRand();
-
-inline uint32 RandU32() {
-  return g_mersenne_twister->genrand_int32();
-}
-
-inline uint64 RandU64() {
-  return (static_cast<uint64>(RandU32()) << 32) | RandU32();
-}
-
-inline double RandDouble() {
-  uint64 rand_u64 = RandU64();
-  return *reinterpret_cast<double*>(&rand_u64);
-}
-
-inline uint32 RandInRange(uint32 range) {
-  return RandU32() % range;
-}
-
-inline bool RandEvent(uint32 frequency) {
-  return RandInRange(frequency) == 0;
-}
-
-inline size_t RandElementCount() {
-  return RandU32() % 10;
-}
-
-}  // namespace ipc_fuzzer
-
-#endif  // TOOLS_IPC_FUZZER_MUTATE_RAND_UTIL_H_