tools/battor_agent: Prints real BattOr samples instead of raw ones

tools/battor_agent/battor_agent.h

Index: tools/battor_agent/battor_agent.h
diff --git a/tools/battor_agent/battor_agent.h b/tools/battor_agent/battor_agent.h
index b69fb5588965cd52d86d8557ce91af2ef01fc9be..430e4b6b11e3af19f445540129114f6afea7b211 100644
--- a/tools/battor_agent/battor_agent.h
+++ b/tools/battor_agent/battor_agent.h
@@ -113,6 +113,9 @@ class BattOrAgent : public BattOrConnection::Listener,
   // Completes the command with the specified error.
   void CompleteCommand(BattOrError error);
 
+  // Returns a formatted version of samples_ with timestamps and real units.
+  std::string SamplesToString();
+
   // The listener that handles the commands' results. It must outlive the agent.
   Listener* listener_;