Add a new LaunchMode value for launches from a user experiment.

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 the shared command-line switches used by code in the Chrome
 // directory that don't have anywhere more specific to go.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
@@ skipping 217 matching lines @@
 extern const char kSupervisedUserId[];
 extern const char kSupervisedUserSyncToken[];
 extern const char kSystemLogUploadFrequency[];
 extern const char kTestName[];
 extern const char kTryChromeAgain[];
 extern const char kUnlimitedStorage[];
 extern const char kUnsafelyTreatInsecureOriginAsSecure[];
 extern const char kUnsafePacUrl[];
 extern const char kUserAgent[];
 extern const char kUserDataDir[];
+extern const char kUserExperimentUx[];
 extern const char kUseSimpleCacheBackend[];
 extern const char kValidateCrx[];
 extern const char kVersion[];
 extern const char kWindowPosition[];
 extern const char kWindowSize[];
 extern const char kWindowWorkspace[];
 extern const char kWinHttpProxyResolver[];
 extern const char kWinJumplistAction[];
 
 #if defined(GOOGLE_CHROME_BUILD)
@@ skipping 123 matching lines @@
 #if defined(OS_WIN)
 bool GDITextPrintingEnabled();
 #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_