Google OAuth Device Flow support for FNL

services/authentication/dummy_authentication_app.cc

Index: services/authentication/dummy_authentication_app.cc
diff --git a/services/authentication/dummy_authentication_app.cc b/services/authentication/dummy_authentication_app.cc
index a829b74e936c1cba0f7543b8e5fe3142d9905917..bc3453dc4504dc73d341c7804721c2b4e9343d76 100644
--- a/services/authentication/dummy_authentication_app.cc
+++ b/services/authentication/dummy_authentication_app.cc
@@ -51,6 +51,13 @@ class DummyAuthenticationApplication
   }
   void ClearOAuth2Token(const mojo::String& token) override {}
 
+  void GetOAuth2DeviceCode(mojo::Array<mojo::String> scopes,
+                           const GetOAuth2TokenCallback& callback) override {
+    callback.Run(nullptr, "Not implemented");
+  }
+
+  void AddAccount(const mojo::String& device_code) override {}
+
   mojo::BindingSet<AuthenticationService> bindings_;
 };