Add XFA pdfium fuzzer

pdf/pdfium/fuzzers/pdfium_fuzzer_helper.h

Index: pdf/pdfium/fuzzers/pdfium_fuzzer_helper.h
diff --git a/pdf/pdfium/fuzzers/pdfium_fuzzer_helper.h b/pdf/pdfium/fuzzers/pdfium_fuzzer_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..7c4f3a3d7df777ea232513faa35b394561373d70
--- /dev/null
+++ b/pdf/pdfium/fuzzers/pdfium_fuzzer_helper.h
@@ -0,0 +1,28 @@
+// Copyright 2017 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 "third_party/pdfium/public/fpdf_ext.h"
+#include "third_party/pdfium/public/fpdf_formfill.h"
+#include "third_party/pdfium/public/fpdfview.h"
+#include "v8/include/v8.h"
+
+class PDFiumFuzzerHelper {
+ public:
+  virtual ~PDFiumFuzzerHelper();
+
+  void RenderPdf(const char* pBuf, size_t len);
+
+  virtual int GetFormCallbackVersion() const = 0;
+  virtual bool OnFormFillEnvLoaded(FPDF_DOCUMENT doc);
+
+ protected:
+  PDFiumFuzzerHelper();
+
+ private:
+  bool RenderPage(const FPDF_DOCUMENT& doc,
+                  const FPDF_FORMHANDLE& form,
+                  const int page_index);
+};