Puts the new Material Design User Manager behind a flag

components/signin/core/common/profile_management_switches.h

Index: components/signin/core/common/profile_management_switches.h
diff --git a/components/signin/core/common/profile_management_switches.h b/components/signin/core/common/profile_management_switches.h
index 2b6044607f80902f1dacaa3ae50009a45b17f8ad..a2f1f1c63604c8e0252faa77863f02acd361c4ed 100644
--- a/components/signin/core/common/profile_management_switches.h
+++ b/components/signin/core/common/profile_management_switches.h
@@ -35,6 +35,9 @@ bool IsNewProfileManagementPreviewEnabled();
 // Checks whether the new gaia password separated sign in flow is enabled.
 bool UsePasswordSeparatedSigninFlow();
 
+// Whether the new Material Design User Manager should be displayed.
+bool IsMaterialDesignUserManager();
+
 // Called in tests to force enabling different modes.
 void EnableNewProfileManagementForTesting(base::CommandLine* command_line);
 void EnableAccountConsistencyForTesting(base::CommandLine* command_line);