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..b2567fb355d3f8ffcf5472f5270855856a8e318c 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 kDisableNewGaiaSigninFlow[];
 extern const char kDisableNewProfileManagement[];
 extern const char kDisableSigninScopedDeviceId[];
 extern const char kEnableAccountConsistency[];
 extern const char kEnableIframeBasedSignin[];
 extern const char kEnableNewAvatarMenu[];
+extern const char kEnableNewGaiaSigninFlow[];
 extern const char kEnableNewProfileManagement[];
 extern const char kEnableRefreshTokenAnnotationRequest[];
 extern const char kExtensionsMultiAccount[];