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 768ae5cd9fec8e314c39382bd4f05c56eab05171..df1c0bcc49d3407e36fc6bce757a18715c99ebc0 100644
--- a/components/signin/core/common/profile_management_switches.cc
+++ b/components/signin/core/common/profile_management_switches.cc
@@ -159,6 +159,11 @@ bool IsNewProfileManagementPreviewEnabled() {
   return false;
 }
 
+bool UsePasswordSeparatedSigninFlow() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnablePasswordSeparatedSigninFlow);
+}
+
 void EnableNewAvatarMenuForTesting(base::CommandLine* command_line) {
   command_line->AppendSwitch(switches::kEnableNewAvatarMenu);
   DCHECK(!command_line->HasSwitch(switches::kDisableNewAvatarMenu));