Puts the new Material Design User Manager behind a flag

components/signin/core/common/profile_management_switches.cc

Index: components/signin/core/common/profile_management_switches.cc
diff --git a/components/signin/core/common/profile_management_switches.cc b/components/signin/core/common/profile_management_switches.cc
index 57c99e7ed32f9b2fc875404cb4adbe06690f8114..a49776224f2478623298b5506478b33251119bb0 100644
--- a/components/signin/core/common/profile_management_switches.cc
+++ b/components/signin/core/common/profile_management_switches.cc
@@ -4,6 +4,8 @@
 
 #include "components/signin/core/common/profile_management_switches.h"
 
+#include <string>
+
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/metrics/field_trial.h"
@@ -134,6 +136,10 @@ bool UsePasswordSeparatedSigninFlow() {
       switches::kUsePasswordSeparatedSigninFlow);
 }
 
+bool IsMaterialDesignUserManager() {
+  return base::FeatureList::IsEnabled(switches::kMaterialDesignUserManager);
+}
+
 void EnableNewProfileManagementForTesting(base::CommandLine* command_line) {
   command_line->AppendSwitch(switches::kEnableNewProfileManagement);
   DCHECK(!command_line->HasSwitch(switches::kDisableNewProfileManagement));