[Desktop] Add diagnostics about loading the refresh tokens.

google_apis/gaia/oauth2_token_service_delegate.cc

Index: google_apis/gaia/oauth2_token_service_delegate.cc
diff --git a/google_apis/gaia/oauth2_token_service_delegate.cc b/google_apis/gaia/oauth2_token_service_delegate.cc
index ccdba7810ce7158d47979e981e6e78444b0e3783..a59c9e8421be514c14c881aaa102ad19e890e849 100644
--- a/google_apis/gaia/oauth2_token_service_delegate.cc
+++ b/google_apis/gaia/oauth2_token_service_delegate.cc
@@ -119,3 +119,8 @@ std::vector<std::string> OAuth2TokenServiceDelegate::GetAccounts() {
 const net::BackoffEntry* OAuth2TokenServiceDelegate::BackoffEntry() const {
   return nullptr;
 }
+
+OAuth2TokenServiceDelegate::LoadCredentialsState
+OAuth2TokenServiceDelegate::GetLoadCredentialsState() const {
+  return LOAD_CREDENTIALS_UNKNOWN;
+}