[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/session.h

 // 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.
 
 #ifndef CHROME_TEST_CHROMEDRIVER_SESSION_H_
 #define CHROME_TEST_CHROMEDRIVER_SESSION_H_
 
 #include <list>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/time/time.h"
 #include "chrome/test/chromedriver/basic_types.h"
 #include "chrome/test/chromedriver/chrome/device_metrics.h"
 #include "chrome/test/chromedriver/chrome/geoposition.h"
+#include "chrome/test/chromedriver/command_listener.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 class Chrome;
 class Status;
 class WebDriverLog;
 class WebView;
 
@@ skipping 41 matching lines @@
   base::TimeDelta script_timeout;
   scoped_ptr<std::string> prompt_text;
   scoped_ptr<Geoposition> overridden_geoposition;
   scoped_ptr<DeviceMetrics> overridden_device_metrics;
   // Logs that populate from DevTools events.
   ScopedVector<WebDriverLog> devtools_logs;
   scoped_ptr<WebDriverLog> driver_log;
   base::ScopedTempDir temp_dir;
   scoped_ptr<base::DictionaryValue> capabilities;
   bool auto_reporting_enabled;
+  // |command_listeners| should be declared after |chrome|. When the |Session|
+  // is destroyed, |command_listeners| should be freed first, since some
+  // |CommandListener|s might be |CommandListenerProxy|s that forward to
+  // |DevToolsEventListener|s owned by |chrome|.
+  ScopedVector<CommandListener> command_listeners;
 };
 
 Session* GetThreadLocalSession();
 
 void SetThreadLocalSession(scoped_ptr<Session> session);
 
 #endif  // CHROME_TEST_CHROMEDRIVER_SESSION_H_