[Password Manager] Setup experiment to restrict autofilling of sync credential

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 8ceab0f288f2bbb00eb2ae19542d3d5af3b81c01..846d5990def36a426ee2e5a76964684ab16849ea 100644
--- a/components/password_manager/core/common/password_manager_switches.cc
+++ b/components/password_manager/core/common/password_manager_switches.cc
@@ -8,6 +8,10 @@ namespace password_manager {
 
 namespace switches {
 
+// Force the password manager to allow sync credentials to be autofilled.
+const char kAllowAutofillSyncCredential[] =
+    "allow-autofill-sync-credential";
+
 // Disable the link in the password manager settings page that points to account
 // central.
 const char kDisableAndroidPasswordLink[] = "disable-android-password-link";
@@ -20,6 +24,15 @@ const char kDisableDropSyncCredential[] =
 const char kDisableManagerForSyncSignin[] =
     "disable-manager-for-sync-signin";
 
+// Disallow autofilling of the sync credential.
+const char kDisallowAutofillSyncCredential[] =
+    "disallow-autofill-sync-credential";
+
+// Disallow autofilling of the sync credential only for transactional reauth
+// pages.
+const char kDisallowAutofillSyncCredentialForReauth[] =
+    "disallow-autofill-sync-credential-for-reauth";
+
 // Enable the link in the password manager settings page that points to account
 // central.
 const char kEnableAndroidPasswordLink[] = "enable-android-password-link";