Add the PPAPI X509 Certificate interface and implementation.

ppapi/thunk/ppb_x509_certificate_private_api.h

+// Copyright (c) 2012 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 PPAPI_THUNK_PPB_X509_CERTIFICATE_PRIVATE_API_H_
+#define PPAPI_THUNK_PPB_X509_CERTIFICATE_PRIVATE_API_H_
+
+#include "ppapi/c/private/ppb_x509_certificate_private.h"
+#include "ppapi/thunk/ppapi_thunk_export.h"
+
+namespace ppapi {
+namespace thunk {
+
+class PPAPI_THUNK_EXPORT PPB_X509Certificate_Private_API {
+ public:
+  virtual ~PPB_X509Certificate_Private_API() {}
+
+  virtual PP_Bool Initialize(const char* bytes, uint32_t length) = 0;
+  virtual PP_Var GetField(PP_X509Certificate_Private_Field field) = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_X509_CERTIFICATE_PRIVATE_API_H_