Adding functionality to specify TLS encryption CUPS print servers for cloudprint connector.

printing/backend/cups_helper.cc

Index: printing/backend/cups_helper.cc
===================================================================
--- printing/backend/cups_helper.cc	(revision 137176)
+++ printing/backend/cups_helper.cc	(working copy)
@@ -14,7 +14,8 @@
 
 // Helper wrapper around http_t structure, with connection and cleanup
 // functionality.
-HttpConnectionCUPS::HttpConnectionCUPS(const GURL& print_server_url)
+HttpConnectionCUPS::HttpConnectionCUPS(const GURL& print_server_url,
+                                       http_encryption_t encryption)
     : http_(NULL) {
   // If we have an empty url, use default print server.
   if (print_server_url.is_empty())
@@ -25,7 +26,7 @@
     port = kDefaultIPPServerPort;
 
   http_ = httpConnectEncrypt(print_server_url.host().c_str(), port,
-                             HTTP_ENCRYPT_NEVER);
+                             encryption);
   if (http_ == NULL) {
     LOG(ERROR) << "CP_CUPS: Failed connecting to print server: " <<
                print_server_url;