Include JSONParser options into its fuzzer.

testing/libfuzzer/fuzzers/base_json_reader_fuzzer.cc

Index: testing/libfuzzer/fuzzers/base_json_reader_fuzzer.cc
diff --git a/testing/libfuzzer/fuzzers/base_json_reader_fuzzer.cc b/testing/libfuzzer/fuzzers/base_json_reader_fuzzer.cc
index fd9d2835dd225c738781256f29306aa5be63246e..7b3e44891b7690816be4bc972f34ac56a2701732 100644
--- a/testing/libfuzzer/fuzzers/base_json_reader_fuzzer.cc
+++ b/testing/libfuzzer/fuzzers/base_json_reader_fuzzer.cc
@@ -10,9 +10,18 @@
 #include "base/json/json_reader.h"
 #include "base/values.h"
 
+int error_code, error_line, error_column;
+std::string error_message;
+
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  base::JSONReader reader;
-  reader.Read(std::string(reinterpret_cast<const char*>(data), size));
+  if (size < 1)
+    return 0;
+
+  const std::string input_string(reinterpret_cast<const char*>(data), size - 1);
+  const int options = data[size - 1];
+  base::JSONReader::ReadAndReturnError(input_string, options, &error_code,
+                                       &error_message, &error_line,
+                                       &error_column);
   return 0;
 }