[chromedriver] Allow commands to be async.

chrome/test/chromedriver/session_thread_map.h

Index: chrome/test/chromedriver/session_thread_map.h
diff --git a/chrome/test/chromedriver/session_thread_map.h b/chrome/test/chromedriver/session_thread_map.h
new file mode 100644
index 0000000000000000000000000000000000000000..03f2eae4fb0ae1e4a0ede549ae279ff2b8433cc9
--- /dev/null
+++ b/chrome/test/chromedriver/session_thread_map.h
@@ -0,0 +1,16 @@
+// 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_THREAD_MAP_H_
+#define CHROME_TEST_CHROMEDRIVER_SESSION_THREAD_MAP_H_
+
+#include <map>
+#include <string>
+
+#include "base/memory/linked_ptr.h"
+#include "base/threading/thread.h"
+
+typedef std::map<std::string, linked_ptr<base::Thread> > SessionThreadMap;
+
+#endif  // CHROME_TEST_CHROMEDRIVER_SESSION_THREAD_MAP_H_