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

components/password_manager/core/browser/password_manager_client.h

Index: components/password_manager/core/browser/password_manager_client.h
diff --git a/components/password_manager/core/browser/password_manager_client.h b/components/password_manager/core/browser/password_manager_client.h
index 4607800d7357cba447fc5773ecca73a2414f282b..7fb6ea2965ba6463302305a102cb71ae1a96f83a 100644
--- a/components/password_manager/core/browser/password_manager_client.h
+++ b/components/password_manager/core/browser/password_manager_client.h
@@ -35,6 +35,10 @@ class PasswordManagerClient {
   // always returns true.
   virtual bool IsPasswordManagerEnabledForCurrentPage() const;
 
+  // Return true if |form| should not be available for autofill.
+  virtual bool ShouldFilterAutofillResult(
+      const autofill::PasswordForm& form) const = 0;
+
   // Returns true if |username| and |origin| correspond to the account which is
   // syncing.
   virtual bool IsSyncAccountCredential(