Add the PPAPI X509 Certificate interface and implementation.

ppapi/proxy/ppapi_param_traits.h

Index: ppapi/proxy/ppapi_param_traits.h
diff --git a/ppapi/proxy/ppapi_param_traits.h b/ppapi/proxy/ppapi_param_traits.h
index 40e4e5bd0b1421a5bef1745fdba78150cee974eb..7edde55e0539afbb2781224ec22e379e4f608a00 100644
--- a/ppapi/proxy/ppapi_param_traits.h
+++ b/ppapi/proxy/ppapi_param_traits.h
@@ -23,6 +23,7 @@ struct PP_NetAddress_Private;
 namespace ppapi {
 
 class HostResource;
+class PPB_X509Certificate_Fields;
 
 namespace proxy {
 
@@ -150,6 +151,14 @@ struct ParamTraits<ppapi::proxy::SerializedFlashMenu> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template<>
+struct PPAPI_PROXY_EXPORT ParamTraits<ppapi::PPB_X509Certificate_Fields> {
+  typedef ppapi::PPB_X509Certificate_Fields param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // PPAPI_PROXY_PPAPI_PARAM_TRAITS_H_