[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/performance_logger.cc

 // Copyright (c) 2013 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 "chrome/test/chromedriver/chrome/performance_logger.h"
+#include "chrome/test/chromedriver/performance_logger.h"
 
 #include "base/json/json_writer.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "chrome/test/chromedriver/chrome/devtools_client.h"
 #include "chrome/test/chromedriver/chrome/log.h"
 #include "chrome/test/chromedriver/chrome/status.h"
 
 namespace {
 
@@ skipping 40 matching lines @@
   log_message_dict.SetString("message.method", method);
   log_message_dict.Set("message.params", params.DeepCopy());
   std::string log_message_json;
   // TODO(klm): extract timestamp from params?
   // Look at where it is for Page, Network, Timeline events.
   base::JSONWriter::Write(&log_message_dict, &log_message_json);
 
   log_->AddEntry(Log::kInfo, log_message_json);
   return Status(kOk);
 }
+
+// TODO(johnmoore): Use BeforeCommand to implement tracing log.
+Status PerformanceLogger::BeforeCommand(const std::string& command_name) {
+  return Status(kOk);
+}