[Win] Add a fast profile switcher to the Windows taskbar item.

components/signin/core/common/profile_management_switches.h

 // 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.
 
 // These are functions to access various profile-management flags but with
 // possible overrides from Experiements.  This is done inside chrome/common
 // because it is accessed by files through the chrome/ directory tree.
 
 #ifndef CHROME_COMMON_PROFILE_MANAGEMENT_SWITCHES_H_
 #define CHROME_COMMON_PROFILE_MANAGEMENT_SWITCHES_H_
@@ skipping 33 matching lines @@
 
 // Whether the new profile management preview has been enabled.
 bool IsNewProfileManagementPreviewEnabled();
 
 // Called in tests to force enabling different modes.
 void EnableNewAvatarMenuForTesting(base::CommandLine* command_line);
 void DisableNewAvatarMenuForTesting(base::CommandLine* command_line);
 void EnableNewProfileManagementForTesting(base::CommandLine* command_line);
 void EnableAccountConsistencyForTesting(base::CommandLine* command_line);
 
+// Checks whether the experiment that replaces the Most Visited category
+// with a Profiles list exists.
+bool HasProfilesJumplistExperiment();
+
 }  // namespace switches
 
 #endif  // CHROME_COMMON_PROFILE_MANAGEMENT_SWITCHES_H_