Implement new password separated sign in flow for chrome desktop.

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 523117410de190be3bee18db532e31d0ea3f83c1..42e78b45aa85aa6df9e486eff3ac3307ea1fe220 100644
--- a/components/signin/core/common/profile_management_switches.cc
+++ b/components/signin/core/common/profile_management_switches.cc
@@ -138,6 +138,11 @@ bool IsNewProfileManagementPreviewEnabled() {
   return false;
 }
 
+bool UsePasswordSeparatedSigninFlow() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnablePasswordSeparatedSigninFlow);
+}
+
 void EnableNewProfileManagementForTesting(base::CommandLine* command_line) {
   command_line->AppendSwitch(switches::kEnableNewProfileManagement);
   DCHECK(!command_line->HasSwitch(switches::kDisableNewProfileManagement));