HostResolver is exposed to plugin.

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index 3293df0dfc54f151d834c58a8e3e2eae2ab34303..db34416dd6354d48cc362f1405dc34ec2fc1e2ec 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -30,6 +30,7 @@
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_size.h"
+#include "ppapi/c/private/ppb_host_resolver_private.h"
 #include "ppapi/c/private/ppb_tcp_socket_private.h"
 #include "ppapi/proxy/ppapi_param_traits.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
@@ -40,6 +41,7 @@
 #include "ppapi/shared_impl/ppb_input_event_shared.h"
 #include "ppapi/shared_impl/ppb_url_request_info_shared.h"
 #include "ppapi/shared_impl/ppb_view_shared.h"
+#include "ppapi/shared_impl/private/ppb_host_resolver_shared.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT PPAPI_PROXY_EXPORT
@@ -320,7 +322,7 @@ IPC_MESSAGE_ROUTED4(PpapiMsg_PPBTCPSocket_WriteACK,
                     bool /* succeeded */,
                     int32_t /* bytes_written */)
 
-// PPB_UDPSocket_Private
+// PPB_UDPSocket_Private.
 IPC_MESSAGE_ROUTED4(PpapiMsg_PPBUDPSocket_BindACK,
                     uint32 /* plugin_dispatcher_id */,
                     uint32 /* socket_id */,
@@ -358,6 +360,13 @@ IPC_MESSAGE_ROUTED5(PpapiMsg_PPBTCPServerSocket_AcceptACK,
                     PP_NetAddress_Private /* local_addr */,
                     PP_NetAddress_Private /* remote_addr */)
 
+// PPB_HostResolver_Private.
+IPC_MESSAGE_ROUTED4(PpapiMsg_PPBHostResolver_ResolveACK,
+                    uint32 /* plugin_dispatcher_id */,
+                    uint32 /* host_resolver_id */,
+                    bool /* succeeded */,
+                    ppapi::NetworkList /* network_list */)
+
 // PPB_Graphics2D.
 IPC_MESSAGE_ROUTED2(PpapiMsg_PPBGraphics2D_FlushACK,
                     ppapi::HostResource /* graphics_2d */,
@@ -907,6 +916,14 @@ IPC_MESSAGE_CONTROL1(PpapiHostMsg_PPBTCPServerSocket_Accept,
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_PPBTCPServerSocket_Destroy,
                      uint32 /* real_socket_id */)
 
+// PPB_HostResolver_Private.
+IPC_MESSAGE_CONTROL5(PpapiHostMsg_PPBHostResolver_Resolve,
+                     int32 /* routing_id */,
+                     uint32 /* plugin_dispatcher_id */,
+                     uint32 /* host_resolver_id */,
+                     ppapi::HostPortPair /* host_port */,
+                     PP_HostResolver_Private_Hint /* hint */)
+
 // PPB_Font.
 IPC_SYNC_MESSAGE_CONTROL0_1(PpapiHostMsg_PPBFont_GetFontFamilies,
                             std::string /* result */)