Pull out common code from client and host versions of ServerLogEntry.

remoting/protocol/server_log_entry_unittest.h

+// Copyright 2014 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.
+
+#include <map>
+#include <set>
+#include <string>
+
+namespace buzz {
+class XmlElement;
+}  // namespace buzz
+
+namespace remoting {
+namespace protocol {
+
+// Verifies a logging stanza.
+// |keyValuePairs| lists the keys that must have specified values, and |keys|
+// lists the keys that must be present, but may have arbitrary values.
+// There must be no other keys.
+bool VerifyStanza(
+    const std::map<std::string, std::string>& key_value_pairs,
+    const std::set<std::string> keys,
+    const buzz::XmlElement* elem,
+    std::string* error);
+
+}  // namespace protocol
+}  // namespace remoting