Pepper: Add support for multicast in PPB_UDPSocket API

ppapi/proxy/udp_socket_resource_base.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_PROXY_UDP_SOCKET_RESOURCE_BASE_H_
 #define PPAPI_PROXY_UDP_SOCKET_RESOURCE_BASE_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 55 matching lines @@
   int32_t RecvFromImpl(char* buffer,
                        int32_t num_bytes,
                        PP_Resource* addr,
                        scoped_refptr<TrackedCallback> callback);
   PP_Bool GetRecvFromAddressImpl(PP_NetAddress_Private* addr);
   int32_t SendToImpl(const char* buffer,
                      int32_t num_bytes,
                      const PP_NetAddress_Private* addr,
                      scoped_refptr<TrackedCallback> callback);
   void CloseImpl();
+  int32_t JoinGroupImpl(const PP_NetAddress_Private *group,
+                        scoped_refptr<TrackedCallback> callback);
+  int32_t LeaveGroupImpl(const PP_NetAddress_Private *group,
+                         scoped_refptr<TrackedCallback> callback);
 
  private:
   struct RecvBuffer {
     int32_t result;
     std::string data;
     PP_NetAddress_Private addr;
   };
 
   // Resource overrides.
   virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
@@ skipping 46 matching lines @@
 
   std::queue<scoped_refptr<TrackedCallback>> sendto_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(UDPSocketResourceBase);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_UDP_SOCKET_RESOURCE_BASE_H_