[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/performance_logger.cc

Index: chrome/test/chromedriver/performance_logger.cc
diff --git a/chrome/test/chromedriver/chrome/performance_logger.cc b/chrome/test/chromedriver/performance_logger.cc
similarity index 90%
rename from chrome/test/chromedriver/chrome/performance_logger.cc
rename to chrome/test/chromedriver/performance_logger.cc
index 4e51a6258411350a3e8c3bc02f2cd49f4b449341..f5875c6479ed7d6a3781bb97f7f2a11de9666b6a 100644
--- a/chrome/test/chromedriver/chrome/performance_logger.cc
+++ b/chrome/test/chromedriver/performance_logger.cc
@@ -2,7 +2,7 @@
 // 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"
@@ -63,3 +63,8 @@ Status PerformanceLogger::OnEvent(
   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);
+}