[Chromoting] Add platform data to heartbeats.

remoting/host/server_log_entry_unittest.cc

Index: remoting/host/server_log_entry_unittest.cc
diff --git a/remoting/host/server_log_entry_unittest.cc b/remoting/host/server_log_entry_unittest.cc
index 5cd94ee990436a625d3e20a70b35dddb29fe2b57..a5aeb43152739ce8c5eb74549900738d084e79c7 100644
--- a/remoting/host/server_log_entry_unittest.cc
+++ b/remoting/host/server_log_entry_unittest.cc
@@ -74,6 +74,18 @@ TEST_F(ServerLogEntryTest, MakeSessionStateChange) {
       error;
 }
 
+TEST_F(ServerLogEntryTest, MakeHeartbeat) {
+  scoped_ptr<ServerLogEntry> entry(ServerLogEntry::MakeHeartbeat());
+  scoped_ptr<XmlElement> stanza = entry->ToStanza();
+  std::string error;
+  std::map<std::string, std::string> key_value_pairs;
+  key_value_pairs["role"] = "host";
+  key_value_pairs["event-name"] = "heartbeat";
+  std::set<std::string> keys;
+  ASSERT_TRUE(VerifyStanza(key_value_pairs, keys, stanza.get(), &error)) <<
+      error;
+}
+
 TEST_F(ServerLogEntryTest, AddHostFields) {
   scoped_ptr<ServerLogEntry> entry(
       ServerLogEntry::MakeSessionStateChange(true));