[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/session.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/session.h"
 
 #include <list>
 
 #include "base/lazy_instance.h"
 #include "base/threading/thread_local.h"
@@ skipping 64 matching lines @@
 }
 
 void Session::SwitchToSubFrame(const std::string& frame_id,
                                const std::string& chromedriver_frame_id) {
   std::string parent_frame_id;
   if (!frames.empty())
     parent_frame_id = frames.back().frame_id;
   frames.push_back(FrameInfo(parent_frame_id, frame_id, chromedriver_frame_id));
 }
 
+void Session::AddListener(CommandListener* listener) {
+  CHECK(listener);
+  command_listeners.push_back(listener);
+}
+
 std::string Session::GetCurrentFrameId() const {
   if (frames.empty())
     return std::string();
   return frames.back().frame_id;
 }
 
 std::vector<WebDriverLog*> Session::GetAllLogs() const {
   std::vector<WebDriverLog*> logs;
   for (ScopedVector<WebDriverLog>::const_iterator log = devtools_logs.begin();
        log != devtools_logs.end();
@@ skipping 18 matching lines @@
   return std::string();
 }
 
 Session* GetThreadLocalSession() {
   return lazy_tls_session.Pointer()->Get();
 }
 
 void SetThreadLocalSession(scoped_ptr<Session> session) {
   lazy_tls_session.Pointer()->Set(session.release());
 }