Added class to subscribe to GCD notifications over XMPP.

remoting/signaling/jid_util.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_SIGNALING_JID_UTIL_H_
 #define REMOTING_SIGNALING_JID_UTIL_H_
 
 #include <string>
 
 namespace remoting {
 
 // Normalizes the |jid| by converting case-insensitive parts (node and domain)
 // to lower-case.
 std::string NormalizeJid(const std::string& jid);
 
+// Splits a JID into a bare JID and a resource suffix.  Either or both
+// of |full_jid| and |resource_suffix| may be null.  If |full_jid| is
+// already a bare JID, |resource_suffix| is set to the empty string.
+// Returns true of |full_jid| has a resource, false if not.
+//
+// e.g. "user@domain/resource" -> "user@domain", "/resource", true

[Sergey Ulanov, 2015/05/15 18:22:37]

I think it's better to remove / from the returned resource, i.e. return
"resource" instead of "/resource". / is not part of the resource.

[John Williams, 2015/05/15 21:59:43]

Done.

+//      "user@domain"          -> "user@domain", "",          false
+bool SplitJidResource(const std::string& full_jid,
+                      std::string* bare_jid,
+                      std::string* resource_suffix);
+
 }  // namespace remoting
 
 #endif  // REMOTING_SIGNALING_JID_UTIL_H_