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

fuzzers/icu_number_format_fuzzer.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+
+// Fuzzer for NumberFormat::parse.
+
+#include <stddef.h>
+#include <stdint.h>
+#include <memory>
+#include "third_party/icu/fuzzers/fuzzer_utils.h"
+#include "third_party/icu/source/i18n/unicode/numfmt.h"
+
+IcuEnvironment* env = new IcuEnvironment();
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  UErrorCode status = U_ZERO_ERROR;
+
+  auto rng = CreateRng(data, size);
+  const icu::Locale& locale = GetRandomLocale(&rng);
+
+  std::unique_ptr<icu::NumberFormat> fmt(
+      icu::NumberFormat::createInstance(locale, status));
+  if (U_FAILURE(status)) return 0;
+
+  icu::UnicodeString str(reinterpret_cast<const char*>(data), size);
+  icu::Formattable result;
+  fmt->parse(str, result, status);
+
+  return 0;
+}