Fix ChromeDriver flakiness with the C# webdriver bindings.

chrome/test/webdriver/webdriver_switches.h

Index: chrome/test/webdriver/webdriver_switches.h
diff --git a/chrome/test/webdriver/webdriver_switches.h b/chrome/test/webdriver/webdriver_switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..639d1b32136b32cb33b504dc29fe9983279d1c81
--- /dev/null
+++ b/chrome/test/webdriver/webdriver_switches.h
@@ -0,0 +1,14 @@
+// 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_WEBDRIVER_WEBDRIVER_SWITCHES_H_
+#define CHROME_TEST_WEBDRIVER_WEBDRIVER_SWITCHES_H_
+
+namespace webdriver {
+
+extern const char kEnableKeepAlive[];
+
+}  // namespace webdriver
+
+#endif  // CHROME_TEST_WEBDRIVER_WEBDRIVER_SWITCHES_H_