AllowBroadcast() is exposed to NaCl.

ppapi/shared_impl/private/udp_socket_private_impl.h

Index: ppapi/shared_impl/private/udp_socket_private_impl.h
diff --git a/ppapi/shared_impl/private/udp_socket_private_impl.h b/ppapi/shared_impl/private/udp_socket_private_impl.h
index 36d51ca0e94b45ac4ea38ba305ba1e4f773451fe..5c5c41491966a42c82f6a54e7a7359eeb1421660 100644
--- a/ppapi/shared_impl/private/udp_socket_private_impl.h
+++ b/ppapi/shared_impl/private/udp_socket_private_impl.h
@@ -40,6 +40,8 @@ class PPAPI_SHARED_EXPORT UDPSocketPrivateImpl
   virtual PPB_UDPSocket_Private_API* AsPPB_UDPSocket_Private_API() OVERRIDE;
 
   // PPB_UDPSocket_Private_API implementation.
+  virtual int32_t SetSocketFeature(PP_UDPSocketFeature_Private name,
+                                   PP_Var value) OVERRIDE;
   virtual int32_t Bind(const PP_NetAddress_Private* addr,
                        scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual PP_Bool GetBoundAddress(PP_NetAddress_Private* addr) OVERRIDE;
@@ -63,6 +65,8 @@ class PPAPI_SHARED_EXPORT UDPSocketPrivateImpl
 
   // Send functions that need to be implemented differently for
   // the proxied and non-proxied derived classes.
+  virtual void SendSetSocketFeature(PP_UDPSocketFeature_Private name,
+                                    PP_Var value) = 0;
   virtual void SendBind(const PP_NetAddress_Private& addr) = 0;
   virtual void SendRecvFrom(int32_t num_bytes) = 0;
   virtual void SendSendTo(const std::string& buffer,