[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/util.h

Index: chrome/test/chromedriver/util.h
diff --git a/chrome/test/chromedriver/util.h b/chrome/test/chromedriver/util.h
index 2e618ed7ae442bc28920f97b0c0fa13d6e2de6bf..d2b6962782580ae59e5b60c4cd1dbe4e7ec983ad 100644
--- a/chrome/test/chromedriver/util.h
+++ b/chrome/test/chromedriver/util.h
@@ -12,6 +12,7 @@ class FilePath;
 class ListValue;
 }
 
+struct Session;
 class Status;
 class WebView;
 
@@ -39,4 +40,8 @@ Status UnzipSoleFile(const base::FilePath& unzip_dir,
                      const std::string& bytes,
                      base::FilePath* file);
 
+// Calls BeforeCommand for each of |session|'s |CommandListener|s.
+void NotifySessionListenersBeforeCommand(Session* session,
+                                         const std::string& command_name);
+
 #endif  // CHROME_TEST_CHROMEDRIVER_UTIL_H_