[libfuzzer] moving icu fuzzers to //third_party/icu, additional fuzzers.

fuzzers/fuzzer_utils.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+
+#ifndef THIRD_PARTY_ICU_FUZZERS_FUZZER_UTILS_H_
+#define THIRD_PARTY_ICU_FUZZERS_FUZZER_UTILS_H_
+
+#include <assert.h>
+#include <random>
+#include "base/at_exit.h"
+#include "base/i18n/icu_util.h"
+#include "third_party/icu/source/common/unicode/locid.h"
+
+struct IcuEnvironment {
+  IcuEnvironment() {
+    base::i18n::InitializeICU();
+  }
+};
+
+// Create RNG and seed it from data.
+std::mt19937_64 CreateRng(const uint8_t* data, size_t size) {
+  std::mt19937_64 rng;
+  std::string str = std::string(reinterpret_cast<const char*>(data), size);
+  std::size_t data_hash = std::hash<std::string>()(str);
+  rng.seed(data_hash);
+  return rng;
+}
+
+const icu::Locale& GetRandomLocale(std::mt19937_64* rng) {
+  int32_t num_locales;
+  assert(num_locales > 0);
+  const icu::Locale* locales = icu::Locale::getAvailableLocales(num_locales);
+  return locales[(*rng)() % num_locales];
+}
+
+#endif  // THIRD_PARTY_ICU_FUZZERS_FUZZER_UTILS_H_