[libfuzzer] unittest-style main driver.

testing/libfuzzer/fuzzers/pdfium_fuzzer.cc

 // Copyright (c) 2015 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.
 
 // This fuzzer is simplified & cleaned up pdfium/samples/pdfium_test.cc
 
+#include <assert.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <list>
 #include <sstream>
 #include <string>
 #include <utility>
@@ skipping 179 matching lines @@
   FPDF_LIBRARY_CONFIG config;
   UNSUPPORT_INFO unsupport_info;
 };
 
 static TestCase* testCase = new TestCase();
 
 extern "C" int LLVMFuzzerTestOneInput(const unsigned char* data, size_t size) {
   RenderPdf(reinterpret_cast<const char*>(data), size);
   return 0;
 }