Add the PPAPI X509 Certificate interface and implementation.

ppapi/cpp/private/x509_certificate_private.h

Index: ppapi/cpp/private/x509_certificate_private.h
diff --git a/ppapi/cpp/private/x509_certificate_private.h b/ppapi/cpp/private/x509_certificate_private.h
new file mode 100644
index 0000000000000000000000000000000000000000..5b316b4216aaf2c3bfc81991ba772a20a291c54a
--- /dev/null
+++ b/ppapi/cpp/private/x509_certificate_private.h
@@ -0,0 +1,35 @@
+// 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_CPP_PRIVATE_X509_CERTIFICATE_PRIVATE_H_
+#define PPAPI_CPP_PRIVATE_X509_CERTIFICATE_PRIVATE_H_
+
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/c/private/ppb_x509_certificate_private.h"
+#include "ppapi/cpp/resource.h"
+
+namespace pp {
+
+class Var;
+
+class X509Certificate : public Resource {
+ public:
+  // Creates an is_null() object.
+  X509Certificate();
+  explicit X509Certificate(PP_Resource resource);
+  explicit X509Certificate(const InstanceHandle& instance);
+
+  // Returns true if the required interface is available.
+  static bool IsAvailable();
+
+  // Creates a new certificate from a DER-encoded representation. Returns true
+  // if the certificate was successfully created.
+  bool Initialize(const char* bytes, uint32_t length);
+  // Returns the specified field as a |Var|.
+  Var GetField(PP_X509Certificate_Private_Field field) const;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_PRIVATE_X509_CERTIFICATE_PRIVATE_H_