Add fuzzers for import of WebCrypto DER-encoded keys.

components/webcrypto/fuzzer_support.h

+// Copyright 2016 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.
+
+#ifndef COMPONENTS_WEBCRYPTO_FUZZER_SUPPORT_H_
+#define COMPONENTS_WEBCRYPTO_FUZZER_SUPPORT_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "third_party/WebKit/public/platform/WebCryptoKey.h"
+
+namespace webcrypto {
+
+void ImportEcKeyFromDerFuzzData(const uint8_t* data,
+                                size_t size,
+                                blink::WebCryptoKeyFormat format);
+
+void ImportRsaKeyFromDerFuzzData(const uint8_t* data,
+                                 size_t size,
+                                 blink::WebCryptoKeyFormat format);
+
+}  // namespace webcrypto
+
+#endif  // COMPONENTS_WEBCRYPTO_FUZZER_SUPPORT_H_