Add ability to reuse address in chrome.sockets.udp

extensions/browser/api/socket/udp_socket.cc

Index: extensions/browser/api/socket/udp_socket.cc
diff --git a/extensions/browser/api/socket/udp_socket.cc b/extensions/browser/api/socket/udp_socket.cc
index e65957493849ae6d1b85eb500974e712870ecfe6..133a09be1a6bd8afd6c62114d198e854b1e6af3f 100644
--- a/extensions/browser/api/socket/udp_socket.cc
+++ b/extensions/browser/api/socket/udp_socket.cc
@@ -33,7 +33,8 @@ UDPSocket::UDPSocket(const std::string& owner_extension_id)
       socket_(net::DatagramSocket::DEFAULT_BIND,
               net::RandIntCallback(),
               NULL,
-              net::NetLog::Source()) {}
+              net::NetLog::Source()),
+      allow_address_reuse_(false) {}
 
 UDPSocket::~UDPSocket() { Disconnect(); }
 
@@ -74,6 +75,10 @@ int UDPSocket::Bind(const std::string& address, uint16_t port) {
   if (result != net::OK)
     return result;
 
+  if (allow_address_reuse()) {
+    socket_.AllowAddressReuse();
+  }
+
   result = socket_.Bind(ip_end_point);
   if (result != net::OK)
     socket_.Close();