Pepper: Add support for multicast in PPB_UDPSocket API

ppapi/api/ppb_udp_socket.idl

Index: ppapi/api/ppb_udp_socket.idl
diff --git a/ppapi/api/ppb_udp_socket.idl b/ppapi/api/ppb_udp_socket.idl
index e4c87b2a1cd5599a71c2e7727bd5d4d370177310..76e26512857da98ae79df788db3d8e268c79a4eb 100644
--- a/ppapi/api/ppb_udp_socket.idl
+++ b/ppapi/api/ppb_udp_socket.idl
@@ -52,7 +52,48 @@ enum PP_UDPSocket_Option {
    * size. Even if <code>SetOption()</code> succeeds, the browser doesn't
    * guarantee it will conform to the size.
    */
-  PP_UDPSOCKET_OPTION_RECV_BUFFER_SIZE = 3
+  PP_UDPSOCKET_OPTION_RECV_BUFFER_SIZE = 3,
+
+  /**
+   * Specifies whether the packets sent from the host to the multicast group
+   * should be looped back to the host or not. Value's type should be
+   * <code>PP_VARTYPE_BOOL</code>.
+   * This option can only be set before calling <code>Bind()</code>.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_LOOP = 4,
+
+  /**
+   * Specifies the time-to-live for packets sent to the multicast group. The
+   * value should be within 0 to 255 range. The default value is 1 and means
+   * that packets will not be routed beyond the local network. Value's type
+   * should be <code>PP_VARTYPE_INT32</code>.
+   * This option can only be set before calling <code>Bind()</code>.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_TTL = 5,
+
+  /**
+   * Specifies the network interface from which the multicast packets will be
+   * sent and received, as specified by <code>PPB_NetworkList</code>. Value's
+   * type should be <code>PP_VARTYPE_INT32</code>.
+   * This option can only be set before calling <code>Bind()</code>.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_IF = 6,
+
+  /**
+   * Joins the multicast group with given address as specifed by
+   * <code>PPB_NetAddress</code> API. Value's type should be
+   * <code>PP_VARTYPE_RESOURCE</code>.
+   * This option can only be set after a successful <code>Bind()</code> call.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_JOIN = 7,
+
+  /**
+   * Leaves the multicast group with given address as specifed by
+   * <code>PPB_NetAddress</code> API. Value's type should be
+   * <code>PP_VARTYPE_RESOURCE</code>.
+   * This option can only be set after a successful <code>Bind()</code> call.
+   */
+  PP_UDPSOCKET_OPTION_MULTICAST_LEAVE = 8
 };
 
 /**