Pepper: Add support for multicast in PPB_UDPSocket API

ppapi/tests/test_udp_socket_private.h

Index: ppapi/tests/test_udp_socket_private.h
diff --git a/ppapi/tests/test_udp_socket_private.h b/ppapi/tests/test_udp_socket_private.h
index e4a23c976e40cadc9e8e77b860aa7acf2b13ccc6..89f861919f655c510deecb029f3a31f40ffeaf52 100644
--- a/ppapi/tests/test_udp_socket_private.h
+++ b/ppapi/tests/test_udp_socket_private.h
@@ -36,11 +36,13 @@ class TestUDPSocketPrivate : public TestCase {
                           pp::UDPSocketPrivate* source,
                           PP_NetAddress_Private* address,
                           const std::string& message);
+  std::string SetMulticastOptions(pp::UDPSocketPrivate* socket);
 
   std::string TestConnect();
   std::string TestConnectFailure();
   std::string TestBroadcast();
   std::string TestSetSocketFeatureErrors();
+  std::string TestMulticast();
 
   std::string host_;
   uint16_t port_;