Added broadcasting feature to UDP server sockets.

net/udp/udp_socket_win.cc

Index: net/udp/udp_socket_win.cc
diff --git a/net/udp/udp_socket_win.cc b/net/udp/udp_socket_win.cc
index a7a11bf32f17e6829eab71273fb1f1556d618f86..03c724ee930760b5026bf8fbe6ce0a9ae4d9ef21 100644
--- a/net/udp/udp_socket_win.cc
+++ b/net/udp/udp_socket_win.cc
@@ -46,6 +46,7 @@ UDPSocketWin::UDPSocketWin(DatagramSocket::BindType bind_type,
                            net::NetLog* net_log,
                            const net::NetLog::Source& source)
     : socket_(INVALID_SOCKET),
+      socket_options_(0),
       bind_type_(bind_type),
       rand_int_cb_(rand_int_cb),
       ALLOW_THIS_IN_INITIALIZER_LIST(read_delegate_(this)),
@@ -229,6 +230,9 @@ int UDPSocketWin::Bind(const IPEndPoint& address) {
   int rv = CreateSocket(address);
   if (rv < 0)
     return rv;
+  rv = SetSocketOptions();
+  if (rv < 0)
+    return rv;
   rv = DoBind(address);
   if (rv < 0)
     return rv;
@@ -260,6 +264,20 @@ bool UDPSocketWin::SetSendBufferSize(int32 size) {
   return rv == 0;
 }
 
+void UDPSocketWin::AllowAddressReuse() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!is_connected());
+
+  socket_options_ |= SOCKET_OPTION_REUSE_ADDRESS;
+}
+
+void UDPSocketWin::AllowBroadcast() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!is_connected());
+
+  socket_options_ |= SOCKET_OPTION_BROADCAST;
+}
+
 void UDPSocketWin::DoReadCallback(int rv) {
   DCHECK_NE(rv, ERR_IO_PENDING);
   DCHECK(!read_callback_.is_null());
@@ -431,6 +449,25 @@ int UDPSocketWin::InternalSendTo(IOBuffer* buf, int buf_len,
   return ERR_IO_PENDING;
 }
 
+int UDPSocketWin::SetSocketOptions() {
+  BOOL true_value = 1;
+  if (socket_options_ & SOCKET_OPTION_REUSE_ADDRESS) {
+    int rv = setsockopt(socket_, SOL_SOCKET, SO_REUSEADDR,
+                        reinterpret_cast<const char*>(&true_value),
+                        sizeof(true_value));
+    if (rv < 0)
+      return MapSystemError(errno);
+  }
+  if (socket_options_ & SOCKET_OPTION_BROADCAST) {
+    int rv = setsockopt(socket_, SOL_SOCKET, SO_BROADCAST,
+                        reinterpret_cast<const char*>(&true_value),
+                        sizeof(true_value));
+    if (rv < 0)
+      return MapSystemError(errno);
+  }
+  return OK;
+}
+
 int UDPSocketWin::DoBind(const IPEndPoint& address) {
   SockaddrStorage storage;
   if (!address.ToSockAddr(storage.addr, &storage.addr_len))