Create AccountServiceFlagFetcher which downloads an account's Gaia service flags.

chrome/browser/signin/fake_profile_oauth2_token_service.h

Index: chrome/browser/signin/fake_profile_oauth2_token_service.h
diff --git a/chrome/browser/signin/fake_profile_oauth2_token_service.h b/chrome/browser/signin/fake_profile_oauth2_token_service.h
index 205ef69b3c0550b96b02647763f08b30bb6e4bad..9b875757b65c31a81443d8d7dee2e1adeb5a6764 100644
--- a/chrome/browser/signin/fake_profile_oauth2_token_service.h
+++ b/chrome/browser/signin/fake_profile_oauth2_token_service.h
@@ -82,6 +82,9 @@ class FakeProfileOAuth2TokenService
   void IssueRefreshTokenForUser(const std::string& account_id,
                                 const std::string& token);
 
+  // Fire OnRefreshTokensLoaded on all observers.
+  void IssueAllRefreshTokensLoaded();
+
   // Gets a list of active requests (can be used by tests to validate that the
   // correct request has been issued).
   std::vector<PendingRequest> GetPendingRequests();
@@ -91,6 +94,10 @@ class FakeProfileOAuth2TokenService
                                 const std::string& access_token,
                                 const base::Time& expiration);
 
+  void IssueErrorForAllPendingRequestsForAccount(
+      const std::string& account_id,
+      const GoogleServiceAuthError& error);
+
   void IssueTokenForScope(const ScopeSet& scopes,
                           const std::string& access_token,
                           const base::Time& expiration);