Added class to subscribe to GCD notifications over XMPP.

remoting/signaling/jid_util.h

Index: remoting/signaling/jid_util.h
diff --git a/remoting/signaling/jid_util.h b/remoting/signaling/jid_util.h
index e7bd7bcac1162c9f7b0e80f7cd00ec7dd6b4cb3e..7660ae38b1ac5d1c67db5acbec2ab7abd61dd61c 100644
--- a/remoting/signaling/jid_util.h
+++ b/remoting/signaling/jid_util.h
@@ -13,6 +13,17 @@ namespace remoting {
 // 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| may be null.  If |full_jid| is already
+// a bare JID, |resource| 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
+//      "user@domain"          -> "user@domain", "",         false
+bool SplitJidResource(const std::string& full_jid,
+                      std::string* bare_jid,
+                      std::string* resource);
+
 }  // namespace remoting
 
 #endif  // REMOTING_SIGNALING_JID_UTIL_H_