Added broadcasting feature to UDP server sockets.

net/udp/udp_socket_win.h

Index: net/udp/udp_socket_win.h
diff --git a/net/udp/udp_socket_win.h b/net/udp/udp_socket_win.h
index e55b1f09366c7771b312aeb4882bfc5c46c608be..106e6b44854eaa91baa3afe3b5cd277b1e124cf6 100644
--- a/net/udp/udp_socket_win.h
+++ b/net/udp/udp_socket_win.h
@@ -106,6 +106,8 @@ class NET_EXPORT UDPSocketWin : NON_EXPORTED_BASE(public base::NonThreadSafe) {
 
   const BoundNetLog& NetLog() const { return net_log_; }
 
+  void AllowBroadcast();
+
  private:
   class ReadDelegate : public base::win::ObjectWatcher::Delegate {
    public:
@@ -157,6 +159,7 @@ class NET_EXPORT UDPSocketWin : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   int InternalRecvFrom(IOBuffer* buf, int buf_len, IPEndPoint* address);
   int InternalSendTo(IOBuffer* buf, int buf_len, const IPEndPoint* address);
 
+  int DoBroadcast();
   int DoBind(const IPEndPoint& address);
   int RandomBind(const IPEndPoint& address);
 
@@ -165,6 +168,7 @@ class NET_EXPORT UDPSocketWin : NON_EXPORTED_BASE(public base::NonThreadSafe) {
   bool ReceiveAddressToIPEndpoint(IPEndPoint* address) const;
 
   SOCKET socket_;
+  bool allow_broadcast_;
 
   // How to do source port binding, used only when UDPSocket is part of
   // UDPClientSocket, since UDPServerSocket provides Bind.