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

fuzzers/icu_break_iterator_fuzzer.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+
+#include <stddef.h>
+#include <stdint.h>
+#include <memory>
+#include "third_party/icu/fuzzers/fuzzer_utils.h"
+#include "third_party/icu/source/common/unicode/brkiter.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;
+  icu::UnicodeString str(reinterpret_cast<const char*>(data), size);
+
+  auto rng = CreateRng(data, size);
+  const icu::Locale& locale = GetRandomLocale(&rng);
+
+  std::unique_ptr<icu::BreakIterator> bi;
+
+  switch (rng() % 5) {
+    case 0:
+      bi.reset(icu::BreakIterator::createWordInstance(locale, status));
+      break;
+    case 1:
+      bi.reset(icu::BreakIterator::createLineInstance(locale, status));
+      break;
+    case 2:
+      bi.reset(icu::BreakIterator::createCharacterInstance(locale, status));
+      break;
+    case 3:
+      bi.reset(icu::BreakIterator::createSentenceInstance(locale, status));
+      break;
+    case 4:
+      bi.reset(icu::BreakIterator::createTitleInstance(locale, status));
+      break;
+  }
+  if (U_FAILURE(status)) return 0;
+
+  for (int32_t p = bi->first(); p != icu::BreakIterator::DONE; p = bi->next())
+    if (U_FAILURE(status)) return 0;
+
+  return 0;
+}
+