[ChromeDriver] Added 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..fccaa5c14b64242c5e882cd40ba7c4cb4975eede 100644
--- a/chrome/test/chromedriver/util.h
+++ b/chrome/test/chromedriver/util.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "chrome/test/chromedriver/session.h"
+
 namespace base {
 class FilePath;
 class ListValue;
@@ -39,4 +41,8 @@ Status UnzipSoleFile(const base::FilePath& unzip_dir,
                      const std::string& bytes,
                      base::FilePath* file);
 
+// Calls BeforeCommand for each of session's CommandListeners
+void NotifySessionListenersBeforeCommand(Session* session,
+                                         const std::string& command_name);
+
 #endif  // CHROME_TEST_CHROMEDRIVER_UTIL_H_