Pepper: Add support for multicast in PPB_UDPSocket API

ppapi/tests/test_udp_socket.h

Index: ppapi/tests/test_udp_socket.h
diff --git a/ppapi/tests/test_udp_socket.h b/ppapi/tests/test_udp_socket.h
index 7c8721ee20c81efa4f2ba0b299c4f7cb5cbc0fcc..d8a8057b85cd68152f35ef530f8b94f989fca2df 100644
--- a/ppapi/tests/test_udp_socket.h
+++ b/ppapi/tests/test_udp_socket.h
@@ -39,10 +39,12 @@ class TestUDPSocket: public TestCase {
                           const pp::NetAddress& target_address,
                           const std::string& message,
                           pp::NetAddress* recvfrom_address);
+  std::string SetMulticastOptions(pp::UDPSocket* socket);
 
   std::string TestReadWrite();
   std::string TestBroadcast();
   std::string TestSetOption();
+  std::string TestMulticast();
 
   pp::NetAddress address_;
 };