[Password Manager] Disable saving and filling on sync signup

components/password_manager/core/common/password_manager_switches.cc

Index: components/password_manager/core/common/password_manager_switches.cc
diff --git a/components/password_manager/core/common/password_manager_switches.cc b/components/password_manager/core/common/password_manager_switches.cc
index c5b167b9315f9a82039dca505d0649b664ff116b..31cba89fb6aebe812380283270be1261c8392e5f 100644
--- a/components/password_manager/core/common/password_manager_switches.cc
+++ b/components/password_manager/core/common/password_manager_switches.cc
@@ -8,6 +8,15 @@ namespace password_manager {
 
 namespace switches {
 
+// Disable both saving and filling for the sync signin form.
+const char kDisableManagerForSyncSignin[] =
+    "disable-manager-for-sync-signin";
+
+// Enable saving and filling for the sync signin form. Currently the default
+// behavior.
+const char kEnableManagerForSyncSignin[] =
+    "enable-manager-for-sync-signin";
+
 // Disables the save-password prompt. Passwords are then saved automatically,
 // without asking the user.
 const char kEnableAutomaticPasswordSaving[] =