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..fff724e35f98dcec3f8a18811d66c1385f5c4206 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 IsMDUserManager();

[anthonyvd, 2016/03/10 16:01:45]

I'd avoid the "MD" abbreviation and go with IsMaterialDesignUserManager() just
so that readers don't have to come and read this comment.

[Alexei Svitkine (slow), 2016/03/10 16:04:33]

Drive-by: Why not use the FeatureList::IsEnabled() switch directly instead of
having a wrapper?

[Moe, 2016/03/10 18:18:21]

simply following the existing standard in this file. I think it's not a bad
thing that this file is hiding implementation details of different
flags/switches

[Moe, 2016/03/10 18:18:21]

Done.

+
 // Called in tests to force enabling different modes.
 void EnableNewProfileManagementForTesting(base::CommandLine* command_line);
 void EnableAccountConsistencyForTesting(base::CommandLine* command_line);