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..b4cc0e664ccfb253c8d948da5c301a55ca723cc9 100644
--- a/extensions/browser/api/socket/udp_socket.cc
+++ b/extensions/browser/api/socket/udp_socket.cc
@@ -74,6 +74,10 @@ int UDPSocket::Bind(const std::string& address, uint16_t port) {
   if (result != net::OK)
     return result;
 
+  if (IsReusable()) {
+    socket_.AllowAddressReuse();
+  }
+
   result = socket_.Bind(ip_end_point);
   if (result != net::OK)
     socket_.Close();
@@ -248,6 +252,11 @@ void UDPSocket::OnSendToComplete(int result) {
 
 bool UDPSocket::IsBound() { return socket_.is_connected(); }
 
+bool UDPSocket::IsReusable() {
+  // Only ResumableUDPSocket can be reusable
+  return false;
+}
+
 int UDPSocket::JoinGroup(const std::string& address) {
   net::IPAddress ip;
   if (!ip.AssignFromIPLiteral(address))
@@ -305,8 +314,13 @@ ResumableUDPSocket::ResumableUDPSocket(const std::string& owner_extension_id)
     : UDPSocket(owner_extension_id),
       persistent_(false),
       buffer_size_(0),
-      paused_(false) {}
+      paused_(false),
+      allow_address_reuse_(false) {}
 
 bool ResumableUDPSocket::IsPersistent() const { return persistent(); }
 
+bool ResumableUDPSocket::IsReusable() {
+  return allow_address_reuse();
+}
+
 }  // namespace extensions