[ChromeDriver] Subscribe PerformanceLogger to CommandListener interface

chrome/test/chromedriver/command_listener_proxy.cc

Index: chrome/test/chromedriver/command_listener_proxy.cc
diff --git a/chrome/test/chromedriver/command_listener_proxy.cc b/chrome/test/chromedriver/command_listener_proxy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..916d38b8284d8030d410dd4535aca2295e100bcc
--- /dev/null
+++ b/chrome/test/chromedriver/command_listener_proxy.cc
@@ -0,0 +1,20 @@
+// Copyright 2014 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/chrome/devtools_client.h"
+#include "chrome/test/chromedriver/chrome/status.h"
+#include "chrome/test/chromedriver/command_listener_proxy.h"
+#include "chrome/test/chromedriver/logging.h"
+
+CommandListenerProxy::CommandListenerProxy(
+    CommandListener* command_listener) : command_listener_(command_listener) {
+  CHECK(command_listener_);
+}
+
+CommandListenerProxy::~CommandListenerProxy() { }
+
+Status CommandListenerProxy::BeforeCommand(const std::string& command_name) {
+  CHECK(command_listener_);

[stgao, 2014/06/27 16:48:24]

It seems this CHECK could be removed, as we already have one in the constructor.

[johnmoore, 2014/06/27 21:58:03]

Done.

+  return command_listener_->BeforeCommand(command_name);
+}