Implement new password separated sign in flow for chrome desktop.

components/signin/core/common/signin_switches.h

Index: components/signin/core/common/signin_switches.h
diff --git a/components/signin/core/common/signin_switches.h b/components/signin/core/common/signin_switches.h
index 68f34ce3340eb97ac1786367779dd522cf6d19d4..5fe9b4ec5b7e78d8a4b12244dcbaf9c7e76a76d2 100644
--- a/components/signin/core/common/signin_switches.h
+++ b/components/signin/core/common/signin_switches.h
@@ -16,11 +16,13 @@ namespace switches {
 extern const char kClearTokenService[];
 extern const char kDisableAccountConsistency[];
 extern const char kDisableNewAvatarMenu[];
+extern const char kDisablePasswordSeparatedSigninFlow[];
 extern const char kDisableNewProfileManagement[];
 extern const char kDisableSigninScopedDeviceId[];
 extern const char kEnableAccountConsistency[];
 extern const char kEnableIframeBasedSignin[];
 extern const char kEnableNewAvatarMenu[];
+extern const char kEnablePasswordSeparatedSigninFlow[];
 extern const char kEnableNewProfileManagement[];
 extern const char kEnableRefreshTokenAnnotationRequest[];
 extern const char kExtensionsMultiAccount[];