[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/commands.cc

 // Copyright (c) 2012 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/commands.h"
 
 #include <algorithm>
 #include <list>
 #include <utility>
 
@@ skipping 133 matching lines @@
                    Status(return_ok_without_session ? kOk : kNoSuchSession),
                    base::Passed(scoped_ptr<base::Value>()),
                    std::string()));
     return;
   }
 
   if (IsVLogOn(0)) {
     VLOG(0) << "COMMAND " << command_name << " "
             << FormatValueForDisplay(*params);
   }
+
+  // Notify |session|'s |CommandListener|s of the command.
+  NotifySessionListenersBeforeCommand(session, command_name);
+
   scoped_ptr<base::Value> value;
   Status status = command.Run(session, *params, &value);
 
   if (status.IsError() && session->chrome) {
     if (!session->quit && session->chrome->HasCrashedWebView()) {
       session->quit = true;
       std::string message("session deleted because of page crash");
       if (!session->detach) {
         Status quit_status = session->chrome->Quit();
         if (quit_status.IsError())
@@ skipping 79 matching lines @@
   }
 }
 
 namespace internal {
 
 void CreateSessionOnSessionThreadForTesting(const std::string& id) {
   SetThreadLocalSession(make_scoped_ptr(new Session(id)));
 }
 
 }  // namespace internal