wifi_sync: add WifiConfigDelegate

components/wifi_sync/wifi_credential.h

Index: components/wifi_sync/wifi_credential.h
diff --git a/components/wifi_sync/wifi_credential.h b/components/wifi_sync/wifi_credential.h
index 7c0342a6c7e142049e9d78854b1cf98d69cd26a9..a7e89298dfbd1431e041f89763bdd1ccbfe1fb36 100644
--- a/components/wifi_sync/wifi_credential.h
+++ b/components/wifi_sync/wifi_credential.h
@@ -47,6 +47,11 @@ class WifiCredential final {  // final because the class is copyable
   // ordering function plumbed in.
   static CredentialSet MakeSet();
 
+  // Returns |ssid| as an SsidBytes instance. This convenience
+  // function simplifies some tests, which need to instantiate
+  // SsidBytes from string literals.
+  static SsidBytes MakeSsidBytes(const std::string& ssid);
+
  private:
   // The WiFi network's SSID.
   const SsidBytes ssid_;