HostResolver is exposed to plugin.

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 63121f0dd384cff6c4df39614e73096723b90df1..3610a30523a1a7620b4bb93d357aa34eeafd5453 100644
--- a/ppapi/proxy/ppapi_param_traits.h
+++ b/ppapi/proxy/ppapi_param_traits.h
@@ -17,12 +17,14 @@
 #include "ppapi/shared_impl/ppb_file_ref_shared.h"
 
 struct PP_FileInfo;
-struct PP_ObjectProperty;
+struct PP_HostResolver_Private_Hint;
 struct PP_NetAddress_Private;
+struct PP_ObjectProperty;
 
 namespace ppapi {
 
 class HostResource;
+class NetworkList;
 
 namespace proxy {
 
@@ -54,6 +56,14 @@ struct ParamTraits<PP_FileInfo> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template<>
+struct ParamTraits<PP_HostResolver_Private_Hint> {
+  typedef PP_HostResolver_Private_Hint param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 template <>
 struct PPAPI_PROXY_EXPORT ParamTraits<PP_NetAddress_Private> {
   typedef PP_NetAddress_Private param_type;
@@ -119,6 +129,14 @@ struct ParamTraits<ppapi::HostResource> {
 };
 
 template<>
+struct ParamTraits<ppapi::NetworkList> {
+  typedef ppapi::NetworkList param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template<>
 struct ParamTraits<ppapi::proxy::SerializedVar> {
   typedef ppapi::proxy::SerializedVar param_type;
   static void Write(Message* m, const param_type& p);