[cros] Add support for transparent background in sign in screen.

chrome/common/chrome_switches.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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
@@ skipping 330 matching lines @@
 extern const char kVisitURLsCount[];
 extern const char kWhitelistedExtensionID[];
 extern const char kWindowPosition[];
 extern const char kWindowSize[];
 extern const char kWinHttpProxyResolver[];
 
 #if defined(OS_CHROMEOS)
 // Keep switches in alphabetical order.
 extern const char kDisableGData[];
 extern const char kEnableLibcros[];
+extern const char kEnableNewOobe[];
 extern const char kEnableTouchpadThreeFingerClick[];
 extern const char kSkipOAuthLogin[];
 extern const char kEnableDevicePolicy[];
 extern const char kEnableGView[];
 extern const char kEnableKioskMode[];
 extern const char kEnableMobileSetupDialog[];
 extern const char kEnableONCPolicy[];
 extern const char kEnableStaticIPConfig[];
 extern const char kKioskModeScreensaverPath[];
 extern const char kLoginManager[];
@@ skipping 61 matching lines @@
 #else
 extern const char kEnablePrintPreview[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_