[ARC] Add browser test of ArcAuthService

chrome/browser/chromeos/arc/arc_auth_context.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 42 matching lines @@
   void OnRefreshTokensLoaded() override;
 
   // UbertokenConsumer:
   void OnUbertokenSuccess(const std::string& token) override;
   void OnUbertokenFailure(const GoogleServiceAuthError& error) override;
 
   // GaiaAuthConsumer:
   void OnMergeSessionSuccess(const std::string& data) override;
   void OnMergeSessionFailure(const GoogleServiceAuthError& error) override;
 
+  // Skips the merge session, instead calling the callback passed to |Prepare()|
+  // once the refresh token is available. Use only in testing.
+  void SkipMergeSessionForTesting() { skip_merge_session_for_testing_ = true; }
+
  private:
   void OnRefreshTokenTimeout();
 
   void StartFetchers();
   void ResetFetchers();
 
   // Unowned pointer.
   ProfileOAuth2TokenService* token_service_;
   std::string account_id_;
   std::string full_account_id_;
 
+  // Whether the merge session should be skipped. Set to true only in testing.
+  bool skip_merge_session_for_testing_ = false;
+
   // Owned by content::BrowserContent. Used to isolate cookies for auth server
   // communication and shared with ARC OptIn UI platform app.
   content::StoragePartition* storage_partition_ = nullptr;
 
   PrepareCallback callback_;
   bool context_prepared_ = false;
 
   base::OneShotTimer refresh_token_timeout_;
   std::unique_ptr<GaiaAuthFetcher> merger_fetcher_;
   std::unique_ptr<UbertokenFetcher> ubertoken_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAuthContext);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_