Use lower-case JIDs when generating signatures for messages sent to CRD bot.

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
new file mode 100644
index 0000000000000000000000000000000000000000..e7bd7bcac1162c9f7b0e80f7cd00ec7dd6b4cb3e
--- /dev/null
+++ b/remoting/signaling/jid_util.h
@@ -0,0 +1,18 @@
+// 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);
+
+}  // namespace remoting
+
+#endif  // REMOTING_SIGNALING_JID_UTIL_H_